165455381 has 16 divisors (see below), whose sum is σ = 205003008. Its totient is φ = 130032000.

The previous prime is 165455371. The next prime is 165455387. The reversal of 165455381 is 183554561.

165455381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165455381 - 2⁶ = 165455317 is a prime.

It is a super-2 number, since 2×165455381² = 54750966203710322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165455387) 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, 7721 + ... + 19761.

It is an arithmetic number, because the mean of its divisors is an integer number (12812688).

Almost surely, 2^165455381 is an apocalyptic number.

It is an amenable number.

165455381 is a deficient number, since it is larger than the sum of its proper divisors (39547627).

165455381 is a wasteful number, since it uses less digits than its factorization.

165455381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212.

The product of its digits is 72000, while the sum is 38.

The square root of 165455381 is about 12862.9460466877. The cubic root of 165455381 is about 548.9847729084.

The spelling of 165455381 in words is "one hundred sixty-five million, four hundred fifty-five thousand, three hundred eighty-one".