56163786121 has 9 divisors (see below), whose sum is σ = 56437410133. Its totient is φ = 55891485760.

The previous prime is 56163786101. The next prime is 56163786127. The reversal of 56163786121 is 12168736165.

It is a happy number.

The square root of 56163786121 is 236989.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 33320486521 + 22843299600 = 182539^2 + 151140^2 .

It is not a de Polignac number, because 56163786121 - 2⁹ = 56163785609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56163786127) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 63749601 + ... + 63750481.

Almost surely, 2^56163786121 is an apocalyptic number.

56163786121 is the 236989-th square number.

56163786121 is the 118495-th centered octagonal number.

It is an amenable number.

56163786121 is a deficient number, since it is larger than the sum of its proper divisors (273624012).

56163786121 is an frugal number, since it uses more digits than its factorization.

56163786121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300 (or 1150 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The spelling of 56163786121 in words is "fifty-six billion, one hundred sixty-three million, seven hundred eighty-six thousand, one hundred twenty-one".