72120755171165 has 16 divisors (see below), whose sum is σ = 91103568916800. Its totient is φ = 54657740172672.

The previous prime is 72120755171149. The next prime is 72120755171209. The reversal of 72120755171165 is 56117155702127.

It is a cyclic number.

It is not a de Polignac number, because 72120755171165 - 2⁴ = 72120755171149 is a prime.

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, 12907832 + ... + 17631041.

It is an arithmetic number, because the mean of its divisors is an integer number (5693973057300).

Almost surely, 2^{72120755171165} is an apocalyptic number.

It is an amenable number.

72120755171165 is a deficient number, since it is larger than the sum of its proper divisors (18982813745635).

72120755171165 is a wasteful number, since it uses less digits than its factorization.

72120755171165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30563756.

The product of its (nonzero) digits is 1029000, while the sum is 50.

The spelling of 72120755171165 in words is "seventy-two trillion, one hundred twenty billion, seven hundred fifty-five million, one hundred seventy-one thousand, one hundred sixty-five".