15255117615 has 16 divisors (see below), whose sum is σ = 24409784448. Its totient is φ = 8135530656.

The previous prime is 15255117593. The next prime is 15255117623. The reversal of 15255117615 is 51671155251.

It is a happy number.

It is not a de Polignac number, because 15255117615 - 2⁵ = 15255117583 is a prime.

It is a super-2 number, since 2×15255117615² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336064 + ... + 378746.

It is an arithmetic number, because the mean of its divisors is an integer number (1525611528).

Almost surely, 2^15255117615 is an apocalyptic number.

15255117615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15255117615 is a deficient number, since it is larger than the sum of its proper divisors (9154666833).

15255117615 is a wasteful number, since it uses less digits than its factorization.

15255117615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66518.

The product of its digits is 52500, while the sum is 39.

It can be divided in two parts, 15255 and 117615, that added together give a triangular number (132870 = T₅₁₅).

The spelling of 15255117615 in words is "fifteen billion, two hundred fifty-five million, one hundred seventeen thousand, six hundred fifteen".