15550660165 has 4 divisors (see below), whose sum is σ = 18660792204. Its totient is φ = 12440528128.

The previous prime is 15550660159. The next prime is 15550660241. The reversal of 15550660165 is 56106605551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2732571076 + 12818089089 = 52274^2 + 113217^2 .

It is a cyclic number.

It is not a de Polignac number, because 15550660165 - 2²⁹ = 15013789253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1555066012 + ... + 1555066021.

It is an arithmetic number, because the mean of its divisors is an integer number (4665198051).

Almost surely, 2^15550660165 is an apocalyptic number.

It is an amenable number.

15550660165 is a deficient number, since it is larger than the sum of its proper divisors (3110132039).

15550660165 is an equidigital number, since it uses as much as digits as its factorization.

15550660165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110132038.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 15550660165 in words is "fifteen billion, five hundred fifty million, six hundred sixty thousand, one hundred sixty-five".