56781964171 has 2 divisors, whose sum is σ = 56781964172. Its totient is φ = 56781964170.

The previous prime is 56781964157. The next prime is 56781964223. The reversal of 56781964171 is 17146918765.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56781964171 - 2²⁹ = 56245093259 is a prime.

It is not a weakly prime, because it can be changed into another prime (56781964471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28390982085 + 28390982086.

It is an arithmetic number, because the mean of its divisors is an integer number (28390982086).

Almost surely, 2^56781964171 is an apocalyptic number.

56781964171 is a deficient number, since it is larger than the sum of its proper divisors (1).

56781964171 is an equidigital number, since it uses as much as digits as its factorization.

56781964171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The spelling of 56781964171 in words is "fifty-six billion, seven hundred eighty-one million, nine hundred sixty-four thousand, one hundred seventy-one".