11623578779569 has 3 divisors (see below), whose sum is σ = 11623582188907. Its totient is φ = 11623575370232.

The previous prime is 11623578779509. The next prime is 11623578779597. The reversal of 11623578779569 is 96597787532611.

The square root of 11623578779569 is 3409337.

It is a perfect power (a square), and thus also a powerful number.

11623578779569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 6854211983025 + 4769366796544 = 2618055^2 + 2183888^2 .

It is not a de Polignac number, because 11623578779569 - 2⁷ = 11623578779441 is a prime.

It is a super-2 number, since 2×11623578779569² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11623578779495 and 11623578779504.

It is not an unprimeable number, because it can be changed into a prime (11623578779509) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1704669 + ... + 5114005.

Almost surely, 2^{11623578779569} is an apocalyptic number.

11623578779569 is the 3409337-th square number.

11623578779569 is the 1704669-th centered octagonal number.

It is an amenable number.

11623578779569 is a deficient number, since it is larger than the sum of its proper divisors (3409338).

11623578779569 is an frugal number, since it uses more digits than its factorization.

11623578779569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6818674 (or 3409337 counting only the distinct ones).

The product of its digits is 1200225600, while the sum is 76.

The spelling of 11623578779569 in words is "eleven trillion, six hundred twenty-three billion, five hundred seventy-eight million, seven hundred seventy-nine thousand, five hundred sixty-nine".