194688640512 has 120 divisors (see below), whose sum is σ = 563104342944. Its totient is φ = 64755339264.

The previous prime is 194688640511. The next prime is 194688640519. The reversal of 194688640512 is 215046886491.

194688640512 is a `hidden beast` number, since 1 + 9 + 4 + 6 + 8 + 86 + 40 + 512 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194688640511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2087878 + ... + 2179130.

Almost surely, 2^194688640512 is an apocalyptic number.

194688640512 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 194688640512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281552171472).

194688640512 is an abundant number, since it is smaller than the sum of its proper divisors (368415702432).

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

194688640512 is an equidigital number, since it uses as much as digits as its factorization.

194688640512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91740 (or 91721 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 194688640512 in words is "one hundred ninety-four billion, six hundred eighty-eight million, six hundred forty thousand, five hundred twelve".