11999977723512 has 96 divisors (see below), whose sum is σ = 33263876954880. Its totient is φ = 3906014978880.

The previous prime is 11999977723453. The next prime is 11999977723549. The reversal of 11999977723512 is 21532777999911.

11999977723512 is a `hidden beast` number, since 1 + 19 + 9 + 9 + 9 + 7 + 77 + 23 + 512 = 666.

It is a super-2 number, since 2×11999977723512² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 12256243 + ... + 13199069.

It is an arithmetic number, because the mean of its divisors is an integer number (346498718280).

Almost surely, 2^{11999977723512} is an apocalyptic number.

11999977723512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11999977723512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16631938477440).

11999977723512 is an abundant number, since it is smaller than the sum of its proper divisors (21263899231368).

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

11999977723512 is a wasteful number, since it uses less digits than its factorization.

11999977723512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946993 (or 946986 counting only the distinct ones).

The product of its digits is 135025380, while the sum is 72.

It can be divided in two parts, 11999977 and 723512, that added together give a square (12723489 = 3567²).

The spelling of 11999977723512 in words is "eleven trillion, nine hundred ninety-nine billion, nine hundred seventy-seven million, seven hundred twenty-three thousand, five hundred twelve".