15165106561 has 8 divisors (see below), whose sum is σ = 17114227200. Its totient is φ = 13311065040.

The previous prime is 15165106549. The next prime is 15165106577. The reversal of 15165106561 is 16560156151.

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

It is a cyclic number.

It is not a de Polignac number, because 15165106561 - 2²¹ = 15163009409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15165106561.

It is not an unprimeable number, because it can be changed into a prime (15165106531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23769441 + ... + 23770078.

It is an arithmetic number, because the mean of its divisors is an integer number (2139278400).

Almost surely, 2^15165106561 is an apocalyptic number.

15165106561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15165106561 is a deficient number, since it is larger than the sum of its proper divisors (1949120639).

15165106561 is a wasteful number, since it uses less digits than its factorization.

15165106561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47539559.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 15165106561 in words is "fifteen billion, one hundred sixty-five million, one hundred six thousand, five hundred sixty-one".