72155505706500 has 96 divisors (see below), whose sum is σ = 210125948078592. Its totient is φ = 19240633440000.

The previous prime is 72155505706451. The next prime is 72155505706517. The reversal of 72155505706500 is 560750555127.

It is a self number, because there is not a number n which added to its sum of digits gives 72155505706500.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 33934720 + ... + 35998280.

It is an arithmetic number, because the mean of its divisors is an integer number (2188811959152).

Almost surely, 2^{72155505706500} is an apocalyptic number.

It is an amenable number.

72155505706500 is an abundant number, since it is smaller than the sum of its proper divisors (137970442372092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72155505706500 is a wasteful number, since it uses less digits than its factorization.

72155505706500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086894 (or 2086882 counting only the distinct ones).

The product of its (nonzero) digits is 1837500, while the sum is 48.

The spelling of 72155505706500 in words is "seventy-two trillion, one hundred fifty-five billion, five hundred five million, seven hundred six thousand, five hundred".