72666165 has 64 divisors (see below), whose sum is σ = 143861760. Its totient is φ = 30792960.

The previous prime is 72666163. The next prime is 72666221. The reversal of 72666165 is 56166627.

It is not a de Polignac number, because 72666165 - 2¹ = 72666163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72666163) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39864 + ... + 41646.

It is an arithmetic number, because the mean of its divisors is an integer number (2247840).

Almost surely, 2^72666165 is an apocalyptic number.

It is an amenable number.

72666165 is a deficient number, since it is larger than the sum of its proper divisors (71195595).

72666165 is a wasteful number, since it uses less digits than its factorization.

72666165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834.

The product of its digits is 90720, while the sum is 39.

The square root of 72666165 is about 8524.4451432337. The cubic root of 72666165 is about 417.2958639653.

It can be divided in two parts, 7266 and 6165, that added together give a palindrome (13431).

The spelling of 72666165 in words is "seventy-two million, six hundred sixty-six thousand, one hundred sixty-five".