165662121 has 16 divisors (see below), whose sum is σ = 232784640. Its totient is φ = 104504400.

The previous prime is 165662113. The next prime is 165662137. The reversal of 165662121 is 121266561.

It is not a de Polignac number, because 165662121 - 2³ = 165662113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165662141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81706 + ... + 83708.

It is an arithmetic number, because the mean of its divisors is an integer number (14549040).

Almost surely, 2^165662121 is an apocalyptic number.

It is an amenable number.

165662121 is a deficient number, since it is larger than the sum of its proper divisors (67122519).

165662121 is a wasteful number, since it uses less digits than its factorization.

165662121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476.

The product of its digits is 4320, while the sum is 30.

The square root of 165662121 is about 12870.9797995335. The cubic root of 165662121 is about 549.2133337682.

The spelling of 165662121 in words is "one hundred sixty-five million, six hundred sixty-two thousand, one hundred twenty-one".