11157971487 has 32 divisors (see below), whose sum is σ = 16412368896. Its totient is φ = 6699369600.

The previous prime is 11157971479. The next prime is 11157971491. The reversal of 11157971487 is 78417975111.

It is not a de Polignac number, because 11157971487 - 2³ = 11157971479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11157971477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1776162 + ... + 1782432.

It is an arithmetic number, because the mean of its divisors is an integer number (512886528).

Almost surely, 2^11157971487 is an apocalyptic number.

11157971487 is a deficient number, since it is larger than the sum of its proper divisors (5254397409).

11157971487 is a wasteful number, since it uses less digits than its factorization.

11157971487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7391.

The product of its digits is 493920, while the sum is 51.

The spelling of 11157971487 in words is "eleven billion, one hundred fifty-seven million, nine hundred seventy-one thousand, four hundred eighty-seven".