18456993810 has 24 divisors (see below), whose sum is σ = 47988184140. Its totient is φ = 4921864992.

The previous prime is 18456993799. The next prime is 18456993847. The reversal of 18456993810 is 1839965481.

It can be written as a sum of positive squares in 2 ways, for example, as 16110463329 + 2346530481 = 126927^2 + 48441^2 .

It is a super-2 number, since 2×18456993810² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102538765 + ... + 102538944.

Almost surely, 2^18456993810 is an apocalyptic number.

18456993810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18456993810 is an abundant number, since it is smaller than the sum of its proper divisors (29531190330).

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

18456993810 is a wasteful number, since it uses less digits than its factorization.

18456993810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205077722 (or 205077719 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 18456993810 in words is "eighteen billion, four hundred fifty-six million, nine hundred ninety-three thousand, eight hundred ten".