18623400432681 has 16 divisors (see below), whose sum is σ = 27113922613440. Its totient is φ = 11276350950720.

The previous prime is 18623400432667. The next prime is 18623400432719.

18623400432681 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18623400432681 - 2³⁰ = 18622326690857 is a prime.

It is a super-2 number, since 2×18623400432681² (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 18623400432681.

It is not an unprimeable number, because it can be changed into a prime (18623400432281) 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, 263924250 + ... + 263994803.

It is an arithmetic number, because the mean of its divisors is an integer number (1694620163340).

Almost surely, 2^{18623400432681} is an apocalyptic number.

18623400432681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18623400432681 is a deficient number, since it is larger than the sum of its proper divisors (8490522180759).

18623400432681 is a wasteful number, since it uses less digits than its factorization.

18623400432681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527920136.

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 18623400432681 in words is "eighteen trillion, six hundred twenty-three billion, four hundred million, four hundred thirty-two thousand, six hundred eighty-one".