18198941544 has 384 divisors, whose sum is σ = 61550227200. Its totient is φ = 4878973440.

The previous prime is 18198941477. The next prime is 18198941573. The reversal of 18198941544 is 44514989181.

18198941544 is a `hidden beast` number, since 1 + 8 + 1 + 9 + 8 + 94 + 1 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 48790542 + ... + 48790914.

It is an arithmetic number, because the mean of its divisors is an integer number (160287050).

Almost surely, 2^18198941544 is an apocalyptic number.

18198941544 is a gapful number since it is divisible by the number (14) 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 18198941544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30775113600).

18198941544 is an abundant number, since it is smaller than the sum of its proper divisors (43351285656).

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

18198941544 is a wasteful number, since it uses less digits than its factorization.

18198941544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 469 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The spelling of 18198941544 in words is "eighteen billion, one hundred ninety-eight million, nine hundred forty-one thousand, five hundred forty-four".