165901893 has 16 divisors (see below), whose sum is σ = 224021376. Its totient is φ = 109198400.

The previous prime is 165901877. The next prime is 165901927. The reversal of 165901893 is 398109561.

It is a cyclic number.

It is not a de Polignac number, because 165901893 - 2⁴ = 165901877 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165901873) 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, 168280 + ... + 169262.

It is an arithmetic number, because the mean of its divisors is an integer number (14001336).

Almost surely, 2^165901893 is an apocalyptic number.

It is an amenable number.

165901893 is a deficient number, since it is larger than the sum of its proper divisors (58119483).

165901893 is a wasteful number, since it uses less digits than its factorization.

165901893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 165901893 is about 12880.2908740447. The cubic root of 165901893 is about 549.4781750358.

The spelling of 165901893 in words is "one hundred sixty-five million, nine hundred one thousand, eight hundred ninety-three".