15551151115555 has 32 divisors (see below), whose sum is σ = 20460908302848. Its totient is φ = 11252759289600.

The previous prime is 15551151115543. The next prime is 15551151115567. The reversal of 15551151115555 is 55551115115551.

It is an interprime number because it is at equal distance from previous prime (15551151115543) and next prime (15551151115567).

It is not a de Polignac number, because 15551151115555 - 2²³ = 15551142726947 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian 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, 16284970 + ... + 17213440.

It is an arithmetic number, because the mean of its divisors is an integer number (639403384464).

Almost surely, 2^{15551151115555} is an apocalyptic number.

15551151115555 is a deficient number, since it is larger than the sum of its proper divisors (4909757187293).

15551151115555 is a wasteful number, since it uses less digits than its factorization.

15551151115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930027.

The product of its digits is 390625, while the sum is 46.

The spelling of 15551151115555 in words is "fifteen trillion, five hundred fifty-one billion, one hundred fifty-one million, one hundred fifteen thousand, five hundred fifty-five".