72365161 has 4 divisors (see below), whose sum is σ = 78943824. Its totient is φ = 65786500.

The previous prime is 72365143. The next prime is 72365177. The reversal of 72365161 is 16156327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72365161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72365261) 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, 3289315 + ... + 3289336.

It is an arithmetic number, because the mean of its divisors is an integer number (19735956).

Almost surely, 2^72365161 is an apocalyptic number.

It is an amenable number.

72365161 is a deficient number, since it is larger than the sum of its proper divisors (6578663).

72365161 is a wasteful number, since it uses less digits than its factorization.

72365161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6578662.

The product of its digits is 7560, while the sum is 31.

The square root of 72365161 is about 8506.7714792393. The cubic root of 72365161 is about 416.7188803545.

The spelling of 72365161 in words is "seventy-two million, three hundred sixty-five thousand, one hundred sixty-one".