11661510660 has 48 divisors (see below), whose sum is σ = 32657034816. Its totient is φ = 3109278592.

The previous prime is 11661510647. The next prime is 11661510683. The reversal of 11661510660 is 6601516611.

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, 658279 + ... + 675761.

It is an arithmetic number, because the mean of its divisors is an integer number (680354892).

Almost surely, 2^11661510660 is an apocalyptic number.

11661510660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661510660 is an abundant number, since it is smaller than the sum of its proper divisors (20995524156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11661510660 is a wasteful number, since it uses less digits than its factorization.

11661510660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28612 (or 28610 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 11661510660 in words is "eleven billion, six hundred sixty-one million, five hundred ten thousand, six hundred sixty".