56203991161 has 2 divisors, whose sum is σ = 56203991162. Its totient is φ = 56203991160.

The previous prime is 56203991141. The next prime is 56203991167. The reversal of 56203991161 is 16119930265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46034277136 + 10169714025 = 214556^2 + 100845^2 .

It is a cyclic number.

It is not a de Polignac number, because 56203991161 - 2²¹ = 56201894009 is a prime.

It is a super-2 number, since 2×56203991161² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56203991167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28101995580 + 28101995581.

It is an arithmetic number, because the mean of its divisors is an integer number (28101995581).

Almost surely, 2^56203991161 is an apocalyptic number.

It is an amenable number.

56203991161 is a deficient number, since it is larger than the sum of its proper divisors (1).

56203991161 is an equidigital number, since it uses as much as digits as its factorization.

56203991161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 56203991161 in words is "fifty-six billion, two hundred three million, nine hundred ninety-one thousand, one hundred sixty-one".