56054551561 has 2 divisors, whose sum is σ = 56054551562. Its totient is φ = 56054551560.

The previous prime is 56054551547. The next prime is 56054551573. The reversal of 56054551561 is 16515545065.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49675494400 + 6379057161 = 222880^2 + 79869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56054551561 is a prime.

It is a super-2 number, since 2×56054551561² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56054558561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28027275780 + 28027275781.

It is an arithmetic number, because the mean of its divisors is an integer number (28027275781).

Almost surely, 2^56054551561 is an apocalyptic number.

It is an amenable number.

56054551561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56054551561 is an equidigital number, since it uses as much as digits as its factorization.

56054551561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 56054551561 in words is "fifty-six billion, fifty-four million, five hundred fifty-one thousand, five hundred sixty-one".