194988637872 has 480 divisors, whose sum is σ = 688367846400. Its totient is φ = 50237687808.

The previous prime is 194988637861. The next prime is 194988637897. The reversal of 194988637872 is 278736889491.

194988637872 is a `hidden beast` number, since 1 + 9 + 498 + 8 + 63 + 7 + 8 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 194988637872.

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, 100872618 + ... + 100874550.

It is an arithmetic number, because the mean of its divisors is an integer number (1434099680).

Almost surely, 2^194988637872 is an apocalyptic number.

194988637872 is a gapful number since it is divisible by the number (12) 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 194988637872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344183923200).

194988637872 is an abundant number, since it is smaller than the sum of its proper divisors (493379208528).

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

194988637872 is a wasteful number, since it uses less digits than its factorization.

194988637872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225 (or 2216 counting only the distinct ones).

The product of its digits is 292626432, while the sum is 72.

The spelling of 194988637872 in words is "one hundred ninety-four billion, nine hundred eighty-eight million, six hundred thirty-seven thousand, eight hundred seventy-two".