165901897 has 12 divisors (see below), whose sum is σ = 193570176. Its totient is φ = 142187220.

The previous prime is 165901877. The next prime is 165901927. The reversal of 165901897 is 798109561.

It is a happy number.

It is not a de Polignac number, because 165901897 - 2¹⁹ = 165377609 is a prime.

It is a Duffinian number.

165901897 is a modest number, since divided by 1897 gives 1659 as remainder.

It is not an unprimeable number, because it can be changed into a prime (165901807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11872 + ... + 21742.

It is an arithmetic number, because the mean of its divisors is an integer number (16130848).

Almost surely, 2^165901897 is an apocalyptic number.

It is an amenable number.

165901897 is a deficient number, since it is larger than the sum of its proper divisors (27668279).

165901897 is an frugal number, since it uses more digits than its factorization.

165901897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9906 (or 9878 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 165901897 is about 12880.2910293207. The cubic root of 165901897 is about 549.4781794519.

The spelling of 165901897 in words is "one hundred sixty-five million, nine hundred one thousand, eight hundred ninety-seven".