15505550666165 has 32 divisors (see below), whose sum is σ = 21297071370240. Its totient is φ = 10616223355200.

The previous prime is 15505550666117. The next prime is 15505550666201. The reversal of 15505550666165 is 56166605550551.

It is not a de Polignac number, because 15505550666165 - 2¹⁰ = 15505550665141 is a prime.

It is a super-2 number, since 2×15505550666165² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15505550666165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219680330 + ... + 219750900.

It is an arithmetic number, because the mean of its divisors is an integer number (665533480320).

Almost surely, 2^{15505550666165} is an apocalyptic number.

It is an amenable number.

15505550666165 is a deficient number, since it is larger than the sum of its proper divisors (5791520704075).

15505550666165 is an equidigital number, since it uses as much as digits as its factorization.

15505550666165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80033.

The product of its (nonzero) digits is 20250000, while the sum is 56.

The spelling of 15505550666165 in words is "fifteen trillion, five hundred five billion, five hundred fifty million, six hundred sixty-six thousand, one hundred sixty-five".