11778944623 has 4 divisors (see below), whose sum is σ = 11783780440. Its totient is φ = 11774108808.

The previous prime is 11778944603. The next prime is 11778944629. The reversal of 11778944623 is 32644987711.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11778944623 - 2²¹ = 11776847471 is a prime.

It is a super-2 number, since 2×11778944623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778944629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2414253 + ... + 2419126.

It is an arithmetic number, because the mean of its divisors is an integer number (2945945110).

Almost surely, 2^11778944623 is an apocalyptic number.

11778944623 is a deficient number, since it is larger than the sum of its proper divisors (4835817).

11778944623 is an equidigital number, since it uses as much as digits as its factorization.

11778944623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835816.

The product of its digits is 2032128, while the sum is 52.

The spelling of 11778944623 in words is "eleven billion, seven hundred seventy-eight million, nine hundred forty-four thousand, six hundred twenty-three".