11661116620 has 24 divisors (see below), whose sum is σ = 25777206000. Its totient is φ = 4418949312.

The previous prime is 11661116617. The next prime is 11661116641. The reversal of 11661116620 is 2661116611.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15343195 + ... + 15343954.

It is an arithmetic number, because the mean of its divisors is an integer number (1074050250).

Almost surely, 2^11661116620 is an apocalyptic number.

11661116620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661116620 is an abundant number, since it is smaller than the sum of its proper divisors (14116089380).

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

11661116620 is a wasteful number, since it uses less digits than its factorization.

11661116620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30687177 (or 30687175 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

Subtracting from 11661116620 its reverse (2661116611), we obtain a palindrome (9000000009).

The spelling of 11661116620 in words is "eleven billion, six hundred sixty-one million, one hundred sixteen thousand, six hundred twenty".