691394493168 has 120 divisors (see below), whose sum is σ = 2077620925536. Its totient is φ = 213852979200.

The previous prime is 691394493149. The next prime is 691394493173. The reversal of 691394493168 is 861394493196.

691394493168 is a `hidden beast` number, since 6 + 9 + 139 + 4 + 493 + 1 + 6 + 8 = 666.

691394493168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1815153 + ... + 2162768.

Almost surely, 2^691394493168 is an apocalyptic number.

691394493168 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

691394493168 is an abundant number, since it is smaller than the sum of its proper divisors (1386226432368).

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

691394493168 is a wasteful number, since it uses less digits than its factorization.

691394493168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978023 (or 3978014 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 63.

The spelling of 691394493168 in words is "six hundred ninety-one billion, three hundred ninety-four million, four hundred ninety-three thousand, one hundred sixty-eight".