165525601515 has 16 divisors (see below), whose sum is σ = 264847504896. Its totient is φ = 88278140000.

The previous prime is 165525601457. The next prime is 165525601519. The reversal of 165525601515 is 515106525561.

It is not a de Polignac number, because 165525601515 - 2²⁹ = 164988730603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165525601519) 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, 630190 + ... + 853340.

It is an arithmetic number, because the mean of its divisors is an integer number (16552969056).

Almost surely, 2^165525601515 is an apocalyptic number.

165525601515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165525601515 is a deficient number, since it is larger than the sum of its proper divisors (99321903381).

165525601515 is a wasteful number, since it uses less digits than its factorization.

165525601515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272610.

The product of its (nonzero) digits is 225000, while the sum is 42.

The spelling of 165525601515 in words is "one hundred sixty-five billion, five hundred twenty-five million, six hundred one thousand, five hundred fifteen".