56907581809 has 4 divisors (see below), whose sum is σ = 61285088116. Its totient is φ = 52530075504.

The previous prime is 56907581791. The next prime is 56907581851. The reversal of 56907581809 is 90818570965.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13901117409 + 43006464400 = 117903^2 + 207380^2 .

It is a cyclic number.

It is not a de Polignac number, because 56907581809 - 2¹⁷ = 56907450737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56907581869) 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, 2188753134 + ... + 2188753159.

It is an arithmetic number, because the mean of its divisors is an integer number (15321272029).

Almost surely, 2^56907581809 is an apocalyptic number.

It is an amenable number.

56907581809 is a deficient number, since it is larger than the sum of its proper divisors (4377506307).

56907581809 is a wasteful number, since it uses less digits than its factorization.

56907581809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377506306.

The product of its (nonzero) digits is 5443200, while the sum is 58.

The spelling of 56907581809 in words is "fifty-six billion, nine hundred seven million, five hundred eighty-one thousand, eight hundred nine".