18506907580 has 48 divisors (see below), whose sum is σ = 44736168960. Its totient is φ = 6299569728.

The previous prime is 18506907569. The next prime is 18506907581. The reversal of 18506907580 is 8570960581.

It is a super-2 number, since 2×18506907580² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18506907581) 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, 456052 + ... + 494971.

It is an arithmetic number, because the mean of its divisors is an integer number (932003520).

Almost surely, 2^18506907580 is an apocalyptic number.

18506907580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18506907580 is an abundant number, since it is smaller than the sum of its proper divisors (26229261380).

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

18506907580 is a wasteful number, since it uses less digits than its factorization.

18506907580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951178 (or 951176 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 18506907580 in words is "eighteen billion, five hundred six million, nine hundred seven thousand, five hundred eighty".