11658591980 has 48 divisors (see below), whose sum is σ = 27988746240. Its totient is φ = 3996070848.

The previous prime is 11658591937. The next prime is 11658591983. The reversal of 11658591980 is 8919585611.

It is a happy number.

It is a super-2 number, since 2×11658591980² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11658591983) 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, 572249 + ... + 592271.

It is an arithmetic number, because the mean of its divisors is an integer number (583098880).

Almost surely, 2^11658591980 is an apocalyptic number.

11658591980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11658591980 is an abundant number, since it is smaller than the sum of its proper divisors (16330154260).

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

11658591980 is a wasteful number, since it uses less digits than its factorization.

11658591980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24198 (or 24196 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 53.

The spelling of 11658591980 in words is "eleven billion, six hundred fifty-eight million, five hundred ninety-one thousand, nine hundred eighty".