11647998187 has 16 divisors (see below), whose sum is σ = 13929674752. Its totient is φ = 9529565760.

The previous prime is 11647998143. The next prime is 11647998191. The reversal of 11647998187 is 78189974611.

It is a cyclic number.

It is not a de Polignac number, because 11647998187 - 2²⁷ = 11513780459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11647948187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351813 + ... + 383494.

It is an arithmetic number, because the mean of its divisors is an integer number (870604672).

Almost surely, 2^11647998187 is an apocalyptic number.

11647998187 is a deficient number, since it is larger than the sum of its proper divisors (2281676565).

11647998187 is an equidigital number, since it uses as much as digits as its factorization.

11647998187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735418.

The product of its digits is 6096384, while the sum is 61.

The spelling of 11647998187 in words is "eleven billion, six hundred forty-seven million, nine hundred ninety-eight thousand, one hundred eighty-seven".