56381528961 has 12 divisors (see below), whose sum is σ = 81466579792. Its totient is φ = 37575412056.

The previous prime is 56381528933. The next prime is 56381528989. The reversal of 56381528961 is 16982518365.

56381528961 is a `hidden beast` number, since 56 + 3 + 8 + 1 + 528 + 9 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (56381528933) and next prime (56381528989).

It is not a de Polignac number, because 56381528961 - 2²¹ = 56379431809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56381528898 and 56381528907.

It is not an unprimeable number, because it can be changed into a prime (56381598961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 993691 + ... + 1048896.

Almost surely, 2^56381528961 is an apocalyptic number.

It is an amenable number.

56381528961 is a deficient number, since it is larger than the sum of its proper divisors (25085050831).

56381528961 is a wasteful number, since it uses less digits than its factorization.

56381528961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045660 (or 2045657 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 56381528961 in words is "fifty-six billion, three hundred eighty-one million, five hundred twenty-eight thousand, nine hundred sixty-one".