165635042565 has 8 divisors (see below), whose sum is σ = 265016068128. Its totient is φ = 88338689360.

The previous prime is 165635042537. The next prime is 165635042579. The reversal of 165635042565 is 565240536561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165635042565 - 2⁷ = 165635042437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5521168071 + ... + 5521168100.

It is an arithmetic number, because the mean of its divisors is an integer number (33127008516).

Almost surely, 2^165635042565 is an apocalyptic number.

165635042565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165635042565 is a deficient number, since it is larger than the sum of its proper divisors (99381025563).

165635042565 is a wasteful number, since it uses less digits than its factorization.

165635042565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11042336179.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 165635042565 in words is "one hundred sixty-five billion, six hundred thirty-five million, forty-two thousand, five hundred sixty-five".