165800913 has 24 divisors (see below), whose sum is σ = 228805632. Its totient is φ = 106785504.

The previous prime is 165800911. The next prime is 165800933. The reversal of 165800913 is 319008561.

It is not a de Polignac number, because 165800913 - 2¹ = 165800911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165800911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841531 + ... + 841727.

It is an arithmetic number, because the mean of its divisors is an integer number (9533568).

Almost surely, 2^165800913 is an apocalyptic number.

It is an amenable number.

165800913 is a deficient number, since it is larger than the sum of its proper divisors (63004719).

165800913 is a wasteful number, since it uses less digits than its factorization.

165800913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 165800913 is about 12876.3703348420. The cubic root of 165800913 is about 549.3666682358.

The spelling of 165800913 in words is "one hundred sixty-five million, eight hundred thousand, nine hundred thirteen".