18061199478 has 128 divisors (see below), whose sum is σ = 48983040000. Its totient is φ = 4821586560.

The previous prime is 18061199407. The next prime is 18061199503. The reversal of 18061199478 is 87499116081.

18061199478 is a `hidden beast` number, since 1 + 80 + 6 + 1 + 1 + 99 + 478 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 313248 + ... + 366396.

It is an arithmetic number, because the mean of its divisors is an integer number (382680000).

Almost surely, 2^18061199478 is an apocalyptic number.

18061199478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18061199478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24491520000).

18061199478 is an abundant number, since it is smaller than the sum of its proper divisors (30921840522).

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

18061199478 is a wasteful number, since it uses less digits than its factorization.

18061199478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53227 (or 53221 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 18061199478 in words is "eighteen billion, sixty-one million, one hundred ninety-nine thousand, four hundred seventy-eight".