15655506051665 has 8 divisors (see below), whose sum is σ = 18788522172288. Its totient is φ = 12523128234480.

The previous prime is 15655506051631. The next prime is 15655506051667. The reversal of 15655506051665 is 56615060555651.

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

It is not a de Polignac number, because 15655506051665 - 2¹⁶ = 15655505986129 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 15655506051665.

It is not an unprimeable number, because it can be changed into a prime (15655506051667) 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, 159521897 + ... + 159620006.

It is an arithmetic number, because the mean of its divisors is an integer number (2348565271536).

Almost surely, 2^{15655506051665} is an apocalyptic number.

It is an amenable number.

15655506051665 is a deficient number, since it is larger than the sum of its proper divisors (3133016120623).

15655506051665 is an equidigital number, since it uses as much as digits as its factorization.

15655506051665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319151719.

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

The spelling of 15655506051665 in words is "fifteen trillion, six hundred fifty-five billion, five hundred six million, fifty-one thousand, six hundred sixty-five".