56172780617 has 4 divisors (see below), whose sum is σ = 56174594436. Its totient is φ = 56170966800.

The previous prime is 56172780581. The next prime is 56172780649. The reversal of 56172780617 is 71608727165.

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 31662999481 + 24509781136 = 177941^2 + 156556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56172780617 is a prime.

It is a super-2 number, since 2×56172780617² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56172780017) 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, 859634 + ... + 922667.

It is an arithmetic number, because the mean of its divisors is an integer number (14043648609).

Almost surely, 2^56172780617 is an apocalyptic number.

It is an amenable number.

56172780617 is a deficient number, since it is larger than the sum of its proper divisors (1813819).

56172780617 is a wasteful number, since it uses less digits than its factorization.

56172780617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813818.

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 56172780617 in words is "fifty-six billion, one hundred seventy-two million, seven hundred eighty thousand, six hundred seventeen".