77622974881 has 3 divisors (see below), whose sum is σ = 77623253491. Its totient is φ = 77622696272.

The previous prime is 77622974867. The next prime is 77622974893. The reversal of 77622974881 is 18847922677.

The square root of 77622974881 is 278609.

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

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., 51714853281 + 25908121600 = 227409^2 + 160960^2 .

It is not a de Polignac number, because 77622974881 - 2⁷ = 77622974753 is a prime.

It is a super-2 number, since 2×77622974881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77622977881) 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, 139305 + ... + 417913.

Almost surely, 2^77622974881 is an apocalyptic number.

77622974881 is the 278609-th square number.

77622974881 is the 139305-th centered octagonal number.

It is an amenable number.

77622974881 is a deficient number, since it is larger than the sum of its proper divisors (278610).

77622974881 is an frugal number, since it uses more digits than its factorization.

77622974881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557218 (or 278609 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 61.

The spelling of 77622974881 in words is "seventy-seven billion, six hundred twenty-two million, nine hundred seventy-four thousand, eight hundred eighty-one".