165121385 has 16 divisors (see below), whose sum is σ = 232787520. Its totient is φ = 110850240.

The previous prime is 165121379. The next prime is 165121399. The reversal of 165121385 is 583121561.

It is not a de Polignac number, because 165121385 - 2¹² = 165117289 is a prime.

It is a Curzon 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, 114755 + ... + 116184.

It is an arithmetic number, because the mean of its divisors is an integer number (14549220).

Almost surely, 2^165121385 is an apocalyptic number.

It is an amenable number.

165121385 is a deficient number, since it is larger than the sum of its proper divisors (67666135).

165121385 is a wasteful number, since it uses less digits than its factorization.

165121385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230968.

The product of its digits is 7200, while the sum is 32.

The square root of 165121385 is about 12849.9566147128. The cubic root of 165121385 is about 548.6151219196.

The spelling of 165121385 in words is "one hundred sixty-five million, one hundred twenty-one thousand, three hundred eighty-five".