191993687352 has 48 divisors (see below), whose sum is σ = 542590860240. Its totient is φ = 61215378048.

The previous prime is 191993687351. The next prime is 191993687381. The reversal of 191993687352 is 253786399191.

191993687352 is a `hidden beast` number, since 1 + 91 + 99 + 36 + 87 + 352 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 191993687352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191993687351) 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, 57967453 + ... + 57970764.

It is an arithmetic number, because the mean of its divisors is an integer number (11303976255).

Almost surely, 2^191993687352 is an apocalyptic number.

191993687352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191993687352 is an abundant number, since it is smaller than the sum of its proper divisors (350597172888).

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

191993687352 is a wasteful number, since it uses less digits than its factorization.

191993687352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115938252 (or 115938245 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The spelling of 191993687352 in words is "one hundred ninety-one billion, nine hundred ninety-three million, six hundred eighty-seven thousand, three hundred fifty-two".