165561495 has 64 divisors (see below), whose sum is σ = 303630336. Its totient is φ = 76308480.

The previous prime is 165561491. The next prime is 165561541. The reversal of 165561495 is 594165561.

It is not a de Polignac number, because 165561495 - 2² = 165561491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 286647 + ... + 287223.

It is an arithmetic number, because the mean of its divisors is an integer number (4744224).

Almost surely, 2^165561495 is an apocalyptic number.

165561495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165561495 is a deficient number, since it is larger than the sum of its proper divisors (138068841).

165561495 is a wasteful number, since it uses less digits than its factorization.

165561495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680.

The product of its digits is 162000, while the sum is 42.

The square root of 165561495 is about 12867.0701793376. The cubic root of 165561495 is about 549.1021107277.

The spelling of 165561495 in words is "one hundred sixty-five million, five hundred sixty-one thousand, four hundred ninety-five".