56221763138 has 6 divisors (see below), whose sum is σ = 84333147699. Its totient is φ = 28110713906.

The previous prime is 56221763137. The next prime is 56221763159. The reversal of 56221763138 is 83136712265.

It can be written as a sum of positive squares in only one way, i.e., 28110881569 + 28110881569 = 167663^2 + 167663^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=167663.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56221763137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 251495 + ... + 419157.

Almost surely, 2^56221763138 is an apocalyptic number.

56221763138 is a deficient number, since it is larger than the sum of its proper divisors (28111384561).

56221763138 is an frugal number, since it uses more digits than its factorization.

56221763138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335328 (or 167665 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The spelling of 56221763138 in words is "fifty-six billion, two hundred twenty-one million, seven hundred sixty-three thousand, one hundred thirty-eight".