18564363775420 has 24 divisors (see below), whose sum is σ = 38985856560000. Its totient is φ = 7425613580352.

The previous prime is 18564363775409. The next prime is 18564363775511. The reversal of 18564363775420 is 2457736346581.

It is a super-2 number, since 2×18564363775420² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7087795 + ... + 9346954.

It is an arithmetic number, because the mean of its divisors is an integer number (1624410690000).

Almost surely, 2^{18564363775420} is an apocalyptic number.

18564363775420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18564363775420 is an abundant number, since it is smaller than the sum of its proper divisors (20421492784580).

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

18564363775420 is a wasteful number, since it uses less digits than its factorization.

18564363775420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16491237 (or 16491235 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 61.

The spelling of 18564363775420 in words is "eighteen trillion, five hundred sixty-four billion, three hundred sixty-three million, seven hundred seventy-five thousand, four hundred twenty".