56774156661 has 8 divisors (see below), whose sum is σ = 84109861760. Its totient is φ = 37849437756.

The previous prime is 56774156653. The next prime is 56774156701. The reversal of 56774156661 is 16665147765.

It is a happy number.

It is not a de Polignac number, because 56774156661 - 2³ = 56774156653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56774156598 and 56774156607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56774156611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051373245 + ... + 1051373298.

It is an arithmetic number, because the mean of its divisors is an integer number (10513732720).

Almost surely, 2^56774156661 is an apocalyptic number.

It is an amenable number.

56774156661 is a deficient number, since it is larger than the sum of its proper divisors (27335705099).

56774156661 is a wasteful number, since it uses less digits than its factorization.

56774156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102746552 (or 2102746546 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The spelling of 56774156661 in words is "fifty-six billion, seven hundred seventy-four million, one hundred fifty-six thousand, six hundred sixty-one".