18856522565881 has 32 divisors (see below), whose sum is σ = 26650366848000. Its totient is φ = 12849283990080.

The previous prime is 18856522565873. The next prime is 18856522565891.

18856522565881 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 18856522565881 - 2³ = 18856522565873 is a prime.

It is a super-2 number, since 2×18856522565881² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18856522565881.

It is not an unprimeable number, because it can be changed into a prime (18856522565891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495709531 + ... + 495747568.

It is an arithmetic number, because the mean of its divisors is an integer number (832823964000).

Almost surely, 2^{18856522565881} is an apocalyptic number.

18856522565881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18856522565881 is a deficient number, since it is larger than the sum of its proper divisors (7793844282119).

18856522565881 is a wasteful number, since it uses less digits than its factorization.

18856522565881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991457149.

The product of its digits is 368640000, while the sum is 70.

The spelling of 18856522565881 in words is "eighteen trillion, eight hundred fifty-six billion, five hundred twenty-two million, five hundred sixty-five thousand, eight hundred eighty-one".