11658860640 has 144 divisors (see below), whose sum is σ = 45469595808. Its totient is φ = 2664880128.

The previous prime is 11658860597. The next prime is 11658860669. The reversal of 11658860640 is 4606885611.

11658860640 is a `hidden beast` number, since 1 + 1 + 6 + 588 + 6 + 0 + 64 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 568237 + ... + 588396.

It is an arithmetic number, because the mean of its divisors is an integer number (315761082).

Almost surely, 2^11658860640 is an apocalyptic number.

11658860640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11658860640 is an abundant number, since it is smaller than the sum of its proper divisors (33810735168).

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

11658860640 is a wasteful number, since it uses less digits than its factorization.

11658860640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156661 (or 1156650 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 11658860640 in words is "eleven billion, six hundred fifty-eight million, eight hundred sixty thousand, six hundred forty".