72172651536655 has 16 divisors (see below), whose sum is σ = 86829049795968. Its totient is φ = 57590228800000.

The previous prime is 72172651536599. The next prime is 72172651536721. The reversal of 72172651536655 is 55663515627127.

It is not a de Polignac number, because 72172651536655 - 2⁷ = 72172651536527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72172651536593 and 72172651536602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28522605 + ... + 30949705.

It is an arithmetic number, because the mean of its divisors is an integer number (5426815612248).

Almost surely, 2^{72172651536655} is an apocalyptic number.

72172651536655 is a deficient number, since it is larger than the sum of its proper divisors (14656398259313).

72172651536655 is a wasteful number, since it uses less digits than its factorization.

72172651536655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442338.

The product of its digits is 79380000, while the sum is 61.

The spelling of 72172651536655 in words is "seventy-two trillion, one hundred seventy-two billion, six hundred fifty-one million, five hundred thirty-six thousand, six hundred fifty-five".