18631413681 has 8 divisors (see below), whose sum is σ = 24853661184. Its totient is φ = 12415054320.

The previous prime is 18631413659. The next prime is 18631413683.

18631413681 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18631413681 - 2⁷ = 18631413553 is a prime.

It is a super-2 number, since 2×18631413681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18631413683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1464646 + ... + 1477311.

It is an arithmetic number, because the mean of its divisors is an integer number (3106707648).

Almost surely, 2^18631413681 is an apocalyptic number.

It is an amenable number.

18631413681 is a deficient number, since it is larger than the sum of its proper divisors (6222247503).

18631413681 is a wasteful number, since it uses less digits than its factorization.

18631413681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944071.

The product of its digits is 82944, while the sum is 42.

The spelling of 18631413681 in words is "eighteen billion, six hundred thirty-one million, four hundred thirteen thousand, six hundred eighty-one".