18667706128840 has 64 divisors (see below), whose sum is σ = 44475323618160. Its totient is φ = 7027485327360.

The previous prime is 18667706128817. The next prime is 18667706128843. The reversal of 18667706128840 is 4882160776681.

It can be written as a sum of positive squares in 8 ways, for example, as 7216669740996 + 11451036387844 = 2686386^2 + 3383938^2 .

It is a super-2 number, since 2×18667706128840² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18667706128843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12894400 + ... + 14268880.

Almost surely, 2^{18667706128840} is an apocalyptic number.

18667706128840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18667706128840 is an abundant number, since it is smaller than the sum of its proper divisors (25807617489320).

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

18667706128840 is a wasteful number, since it uses less digits than its factorization.

18667706128840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394482 (or 1394478 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 64.

The spelling of 18667706128840 in words is "eighteen trillion, six hundred sixty-seven billion, seven hundred six million, one hundred twenty-eight thousand, eight hundred forty".