18944551080 has 512 divisors, whose sum is σ = 79209446400. Its totient is φ = 3920596992.

The previous prime is 18944551079. The next prime is 18944551097. The reversal of 18944551080 is 8015544981.

It is a happy number.

18944551080 is a `hidden beast` number, since 1 + 8 + 94 + 4 + 551 + 0 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5207022 + ... + 5210658.

It is an arithmetic number, because the mean of its divisors is an integer number (154705950).

Almost surely, 2^18944551080 is an apocalyptic number.

18944551080 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 18944551080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39604723200).

18944551080 is an abundant number, since it is smaller than the sum of its proper divisors (60264895320).

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

18944551080 is a wasteful number, since it uses less digits than its factorization.

18944551080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730 (or 3720 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 18944551080 in words is "eighteen billion, nine hundred forty-four million, five hundred fifty-one thousand, eighty".