18815481900 has 360 divisors, whose sum is σ = 62455950480. Its totient is φ = 4898880000.

The previous prime is 18815481889. The next prime is 18815481947. The reversal of 18815481900 is 918451881.

18815481900 is a `hidden beast` number, since 1 + 8 + 81 + 5 + 481 + 90 + 0 = 666.

It is a super-2 number, since 2×18815481900² (a number of 21 digits) contains 22 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 89172795 + ... + 89173005.

Almost surely, 2^18815481900 is an apocalyptic number.

18815481900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18815481900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31227975240).

18815481900 is an abundant number, since it is smaller than the sum of its proper divisors (43640468580).

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

18815481900 is a wasteful number, since it uses less digits than its factorization.

18815481900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 45.

The spelling of 18815481900 in words is "eighteen billion, eight hundred fifteen million, four hundred eighty-one thousand, nine hundred".