18266566580 has 12 divisors (see below), whose sum is σ = 38359789860. Its totient is φ = 7306626624.

The previous prime is 18266566553. The next prime is 18266566597. The reversal of 18266566580 is 8566566281.

It can be written as a sum of positive squares in 2 ways, for example, as 5249582116 + 13016984464 = 72454^2 + 114092^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456664145 + ... + 456664184.

It is an arithmetic number, because the mean of its divisors is an integer number (3196649155).

Almost surely, 2^18266566580 is an apocalyptic number.

18266566580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18266566580 is an abundant number, since it is smaller than the sum of its proper divisors (20093223280).

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

18266566580 is a wasteful number, since it uses less digits than its factorization.

18266566580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913328338 (or 913328336 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 18266566580 in words is "eighteen billion, two hundred sixty-six million, five hundred sixty-six thousand, five hundred eighty".