18821265800 has 24 divisors (see below), whose sum is σ = 43759443450. Its totient is φ = 7528506240.

The previous prime is 18821265797. The next prime is 18821265823. The reversal of 18821265800 is 856212881.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 10692800836 + 8128464964 = 103406^2 + 90158^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47052965 + ... + 47053364.

Almost surely, 2^18821265800 is an apocalyptic number.

18821265800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18821265800 is an abundant number, since it is smaller than the sum of its proper divisors (24938177650).

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

18821265800 is a wasteful number, since it uses less digits than its factorization.

18821265800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94106345 (or 94106336 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 18821265800 in words is "eighteen billion, eight hundred twenty-one million, two hundred sixty-five thousand, eight hundred".