18918046524978 has 80 divisors (see below), whose sum is σ = 42831319262424. Its totient is φ = 6240441553920.

The previous prime is 18918046524959. The next prime is 18918046524989. The reversal of 18918046524978 is 87942564081981.

18918046524978 is a `hidden beast` number, since 1 + 8 + 9 + 1 + 8 + 0 + 4 + 6 + 524 + 97 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18075107699289 + 842938825689 = 4251483^2 + 918117^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 196644048 + ... + 196740228.

Almost surely, 2^{18918046524978} is an apocalyptic number.

18918046524978 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 18918046524978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21415659631212).

18918046524978 is an abundant number, since it is smaller than the sum of its proper divisors (23913272737446).

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

18918046524978 is a wasteful number, since it uses less digits than its factorization.

18918046524978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108809 (or 108800 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 72.

The spelling of 18918046524978 in words is "eighteen trillion, nine hundred eighteen billion, forty-six million, five hundred twenty-four thousand, nine hundred seventy-eight".