56635781567 has 2 divisors, whose sum is σ = 56635781568. Its totient is φ = 56635781566.

The previous prime is 56635781513. The next prime is 56635781581. The reversal of 56635781567 is 76518753665.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56635781567 is a prime.

It is a super-2 number, since 2×56635781567² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56635781597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28317890783 + 28317890784.

It is an arithmetic number, because the mean of its divisors is an integer number (28317890784).

Almost surely, 2^56635781567 is an apocalyptic number.

56635781567 is a deficient number, since it is larger than the sum of its proper divisors (1).

56635781567 is an equidigital number, since it uses as much as digits as its factorization.

56635781567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752000, while the sum is 59.

The spelling of 56635781567 in words is "fifty-six billion, six hundred thirty-five million, seven hundred eighty-one thousand, five hundred sixty-seven".