165643615 has 16 divisors (see below), whose sum is σ = 209848320. Its totient is φ = 125172000.

The previous prime is 165643613. The next prime is 165643627. The reversal of 165643615 is 516346561.

It is not a de Polignac number, because 165643615 - 2¹ = 165643613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165643613) 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, 32490 + ... + 37240.

It is an arithmetic number, because the mean of its divisors is an integer number (13115520).

Almost surely, 2^165643615 is an apocalyptic number.

165643615 is a deficient number, since it is larger than the sum of its proper divisors (44204705).

165643615 is a wasteful number, since it uses less digits than its factorization.

165643615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142.

The product of its digits is 64800, while the sum is 37.

The square root of 165643615 is about 12870.2608753669. The cubic root of 165643615 is about 549.1928822605.

The spelling of 165643615 in words is "one hundred sixty-five million, six hundred forty-three thousand, six hundred fifteen".