691925436340 has 24 divisors (see below), whose sum is σ = 1476863802792. Its totient is φ = 272232958080.

The previous prime is 691925436317. The next prime is 691925436359. The reversal of 691925436340 is 43634529196.

It can be written as a sum of positive squares in 4 ways, for example, as 30869136 + 691894567204 = 5556^2 + 831802^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283574779 + ... + 283577218.

It is an arithmetic number, because the mean of its divisors is an integer number (61535991783).

Almost surely, 2^691925436340 is an apocalyptic number.

It is an amenable number.

691925436340 is an abundant number, since it is smaller than the sum of its proper divisors (784938366452).

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

691925436340 is a wasteful number, since it uses less digits than its factorization.

691925436340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567152067 (or 567152065 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 52.

The spelling of 691925436340 in words is "six hundred ninety-one billion, nine hundred twenty-five million, four hundred thirty-six thousand, three hundred forty".