691207316352 has 256 divisors, whose sum is σ = 2333090227200. Its totient is φ = 197349156864.

The previous prime is 691207316339. The next prime is 691207316369. The reversal of 691207316352 is 253613702196.

691207316352 is a `hidden beast` number, since 6 + 9 + 1 + 2 + 0 + 7 + 3 + 1 + 635 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 691207316298 and 691207316307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37318998 + ... + 37337514.

It is an arithmetic number, because the mean of its divisors is an integer number (9113633700).

Almost surely, 2^691207316352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691207316352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166545113600).

691207316352 is an abundant number, since it is smaller than the sum of its proper divisors (1641882910848).

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

691207316352 is a wasteful number, since it uses less digits than its factorization.

691207316352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090 (or 20072 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 691207316352 in words is "six hundred ninety-one billion, two hundred seven million, three hundred sixteen thousand, three hundred fifty-two".