15551131115 has 32 divisors (see below), whose sum is σ = 21242760000. Its totient is φ = 10834145280.

The previous prime is 15551131097. The next prime is 15551131139. The reversal of 15551131115 is 51113115551.

It is not a de Polignac number, because 15551131115 - 2¹⁴ = 15551114731 is a prime.

It is a super-2 number, since 2×15551131115² (a number of 21 digits) contains 22 as substring.

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, 271511 + ... + 323759.

It is an arithmetic number, because the mean of its divisors is an integer number (663836250).

Almost surely, 2^15551131115 is an apocalyptic number.

15551131115 is a deficient number, since it is larger than the sum of its proper divisors (5691628885).

15551131115 is a wasteful number, since it uses less digits than its factorization.

15551131115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52527.

The product of its digits is 1875, while the sum is 29.

Adding to 15551131115 its reverse (51113115551), we get a palindrome (66664246666).

The spelling of 15551131115 in words is "fifteen billion, five hundred fifty-one million, one hundred thirty-one thousand, one hundred fifteen".