11981621160 has 96 divisors (see below), whose sum is σ = 40989780000. Its totient is φ = 3026934144.

The previous prime is 11981621137. The next prime is 11981621161. The reversal of 11981621160 is 6112618911.

It is a happy number.

11981621160 is a `hidden beast` number, since 1 + 19 + 8 + 1 + 621 + 16 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (11981621161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 869010 + ... + 882689.

It is an arithmetic number, because the mean of its divisors is an integer number (426976875).

Almost surely, 2^11981621160 is an apocalyptic number.

11981621160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11981621160 is an abundant number, since it is smaller than the sum of its proper divisors (29008158840).

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

11981621160 is a wasteful number, since it uses less digits than its factorization.

11981621160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751735 (or 1751728 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The spelling of 11981621160 in words is "eleven billion, nine hundred eighty-one million, six hundred twenty-one thousand, one hundred sixty".