18807653881 has 9 divisors (see below), whose sum is σ = 19482676941. Its totient is φ = 18155274144.

The previous prime is 18807653869. The next prime is 18807653941. The reversal of 18807653881 is 18835670881.

The square root of 18807653881 is 137141.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 6294994281 + 12512659600 = 79341^2 + 111860^2 .

It is not a de Polignac number, because 18807653881 - 2¹⁵ = 18807621113 is a prime.

It is a super-2 number, since 2×18807653881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18807653801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3974725 + ... + 3979453.

Almost surely, 2^18807653881 is an apocalyptic number.

18807653881 is the 137141-st square number.

18807653881 is the 68571-st centered octagonal number.

It is an amenable number.

18807653881 is a deficient number, since it is larger than the sum of its proper divisors (675023060).

18807653881 is an frugal number, since it uses more digits than its factorization.

18807653881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516 (or 4758 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 18807653881 in words is "eighteen billion, eight hundred seven million, six hundred fifty-three thousand, eight hundred eighty-one".