18869156739972 has 432 divisors, whose sum is σ = 64005407780160. Its totient is φ = 4787094090240.

The previous prime is 18869156739949. The next prime is 18869156739991. The reversal of 18869156739972 is 27993765196881.

18869156739972 is a `hidden beast` number, since 1 + 8 + 8 + 6 + 9 + 156 + 7 + 399 + 72 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18869156739891 and 18869156739900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 27191628 + ... + 27876924.

Almost surely, 2^{18869156739972} is an apocalyptic number.

18869156739972 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 18869156739972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32002703890080).

18869156739972 is an abundant number, since it is smaller than the sum of its proper divisors (45136251040188).

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

18869156739972 is a wasteful number, since it uses less digits than its factorization.

18869156739972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685389 (or 685363 counting only the distinct ones).

The product of its digits is 2469035520, while the sum is 81.

The spelling of 18869156739972 in words is "eighteen trillion, eight hundred sixty-nine billion, one hundred fifty-six million, seven hundred thirty-nine thousand, nine hundred seventy-two".