18681356200 has 48 divisors (see below), whose sum is σ = 46775248380. Its totient is φ = 6897730560.

The previous prime is 18681356179. The next prime is 18681356233. The reversal of 18681356200 is 265318681.

It can be written as a sum of positive squares in 6 ways, for example, as 5845825764 + 12835530436 = 76458^2 + 113294^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3589969 + ... + 3595168.

Almost surely, 2^18681356200 is an apocalyptic number.

18681356200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18681356200 is an abundant number, since it is smaller than the sum of its proper divisors (28093892180).

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

18681356200 is a wasteful number, since it uses less digits than its factorization.

18681356200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7185166 (or 7185157 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 18681356200 in words is "eighteen billion, six hundred eighty-one million, three hundred fifty-six thousand, two hundred".