18951766688412 has 60 divisors (see below), whose sum is σ = 49566847237600. Its totient is φ = 6314299199424.

The previous prime is 18951766688363. The next prime is 18951766688443. The reversal of 18951766688412 is 21488666715981.

It is a happy number.

It is a super-2 number, since 2×18951766688412² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 12993412 + ... + 14378187.

Almost surely, 2^{18951766688412} is an apocalyptic number.

18951766688412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18951766688412 is an abundant number, since it is smaller than the sum of its proper divisors (30615080549188).

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

18951766688412 is a wasteful number, since it uses less digits than its factorization.

18951766688412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27373752 (or 27373741 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 72.

The spelling of 18951766688412 in words is "eighteen trillion, nine hundred fifty-one billion, seven hundred sixty-six million, six hundred eighty-eight thousand, four hundred twelve".