72534556138 has 16 divisors (see below), whose sum is σ = 118701948960. Its totient is φ = 32967742000.

The previous prime is 72534556117. The next prime is 72534556169. The reversal of 72534556138 is 83165543527.

It is a happy number.

It is a super-2 number, since 2×72534556138² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72534556091 and 72534556100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187233 + ... + 424411.

It is an arithmetic number, because the mean of its divisors is an integer number (7418871810).

Almost surely, 2^72534556138 is an apocalyptic number.

72534556138 is a deficient number, since it is larger than the sum of its proper divisors (46167392822).

72534556138 is a wasteful number, since it uses less digits than its factorization.

72534556138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251093.

The product of its digits is 3024000, while the sum is 49.

The spelling of 72534556138 in words is "seventy-two billion, five hundred thirty-four million, five hundred fifty-six thousand, one hundred thirty-eight".