72770353165 has 4 divisors (see below), whose sum is σ = 87324423804. Its totient is φ = 58216282528.

The previous prime is 72770353163. The next prime is 72770353217. The reversal of 72770353165 is 56135307727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48288744009 + 24481609156 = 219747^2 + 156466^2 .

It is a cyclic number.

It is not a de Polignac number, because 72770353165 - 2¹ = 72770353163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72770353163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7277035312 + ... + 7277035321.

It is an arithmetic number, because the mean of its divisors is an integer number (21831105951).

Almost surely, 2^72770353165 is an apocalyptic number.

It is an amenable number.

72770353165 is a deficient number, since it is larger than the sum of its proper divisors (14554070639).

72770353165 is a wasteful number, since it uses less digits than its factorization.

72770353165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554070638.

The product of its (nonzero) digits is 926100, while the sum is 46.

The spelling of 72770353165 in words is "seventy-two billion, seven hundred seventy million, three hundred fifty-three thousand, one hundred sixty-five".