18664921069056 has 160 divisors (see below), whose sum is σ = 55255263972480. Its totient is φ = 6220987066368.

The previous prime is 18664921069043. The next prime is 18664921069103. The reversal of 18664921069056 is 65096012946681.

18664921069056 is a `hidden beast` number, since 1 + 8 + 6 + 6 + 492 + 1 + 0 + 6 + 90 + 56 = 666.

It is a super-2 number, since 2×18664921069056² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18664921068984 and 18664921069002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141865255 + ... + 141996761.

It is an arithmetic number, because the mean of its divisors is an integer number (345345399828).

Almost surely, 2^{18664921069056} is an apocalyptic number.

18664921069056 is a gapful number since it is divisible by the number (16) 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 18664921069056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27627631986240).

18664921069056 is an abundant number, since it is smaller than the sum of its proper divisors (36590342903424).

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

18664921069056 is a wasteful number, since it uses less digits than its factorization.

18664921069056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141801 (or 141779 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 18664921069056 in words is "eighteen trillion, six hundred sixty-four billion, nine hundred twenty-one million, sixty-nine thousand, fifty-six".