165861297 has 16 divisors (see below), whose sum is σ = 280823680. Its totient is φ = 94777776.

The previous prime is 165861281. The next prime is 165861301. The reversal of 165861297 is 792168561.

It is not a de Polignac number, because 165861297 - 2⁴ = 165861281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165861217) 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, 438598 + ... + 438975.

It is an arithmetic number, because the mean of its divisors is an integer number (17551480).

Almost surely, 2^165861297 is an apocalyptic number.

It is an amenable number.

165861297 is a deficient number, since it is larger than the sum of its proper divisors (114962383).

165861297 is an equidigital number, since it uses as much as digits as its factorization.

165861297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877589 (or 877583 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 165861297 is about 12878.7148815400. The cubic root of 165861297 is about 549.4333524897.

The spelling of 165861297 in words is "one hundred sixty-five million, eight hundred sixty-one thousand, two hundred ninety-seven".