18199564020 has 108 divisors (see below), whose sum is σ = 60680326980. Its totient is φ = 4412010240.

The previous prime is 18199563929. The next prime is 18199564043. The reversal of 18199564020 is 2046599181.

18199564020 is a `hidden beast` number, since 1 + 8 + 199 + 56 + 402 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7339006224 + 10860557796 = 85668^2 + 104214^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 396025 + ... + 439584.

Almost surely, 2^18199564020 is an apocalyptic number.

18199564020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18199564020 is an abundant number, since it is smaller than the sum of its proper divisors (42480762960).

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

18199564020 is a wasteful number, since it uses less digits than its factorization.

18199564020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835646 (or 835630 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 18199564020 in words is "eighteen billion, one hundred ninety-nine million, five hundred sixty-four thousand, twenty".