15255121544055 has 24 divisors (see below), whose sum is σ = 26469110255328. Its totient is φ = 8127788030016.

The previous prime is 15255121544053. The next prime is 15255121544137. The reversal of 15255121544055 is 55044512155251.

It is a happy number.

15255121544055 is a `hidden beast` number, since 1 + 5 + 2 + 5 + 51 + 2 + 1 + 544 + 0 + 55 = 666.

It is not a de Polignac number, because 15255121544055 - 2¹ = 15255121544053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 15255121544055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15255121544051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172388472 + ... + 172476941.

It is an arithmetic number, because the mean of its divisors is an integer number (1102879593972).

Almost surely, 2^{15255121544055} is an apocalyptic number.

15255121544055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15255121544055 is a deficient number, since it is larger than the sum of its proper divisors (11213988711273).

15255121544055 is a wasteful number, since it uses less digits than its factorization.

15255121544055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344866407 (or 344866404 counting only the distinct ones).

The product of its (nonzero) digits is 1000000, while the sum is 45.

The spelling of 15255121544055 in words is "fifteen trillion, two hundred fifty-five billion, one hundred twenty-one million, five hundred forty-four thousand, fifty-five".