56821517138 has 16 divisors (see below), whose sum is σ = 86227958400. Its totient is φ = 28080756000.

The previous prime is 56821517113. The next prime is 56821517147. The reversal of 56821517138 is 83171512865.

It is a super-2 number, since 2×56821517138² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56821517092 and 56821517101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412643 + ... + 532838.

It is an arithmetic number, because the mean of its divisors is an integer number (5389247400).

Almost surely, 2^56821517138 is an apocalyptic number.

56821517138 is a deficient number, since it is larger than the sum of its proper divisors (29406441262).

56821517138 is a wasteful number, since it uses less digits than its factorization.

56821517138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945833.

The product of its digits is 403200, while the sum is 47.

The spelling of 56821517138 in words is "fifty-six billion, eight hundred twenty-one million, five hundred seventeen thousand, one hundred thirty-eight".