691485375752 has 64 divisors (see below), whose sum is σ = 1333988838000. Its totient is φ = 335919744000.

The previous prime is 691485375739. The next prime is 691485375773. The reversal of 691485375752 is 257573584196.

It can be written as a sum of positive squares in 8 ways, for example, as 50726751076 + 640758624676 = 225226^2 + 800474^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13134602 + ... + 13187142.

Almost surely, 2^691485375752 is an apocalyptic number.

It is an amenable number.

691485375752 is a deficient number, since it is larger than the sum of its proper divisors (642503462248).

691485375752 is a wasteful number, since it uses less digits than its factorization.

691485375752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52938 (or 52934 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 62.

The spelling of 691485375752 in words is "six hundred ninety-one billion, four hundred eighty-five million, three hundred seventy-five thousand, seven hundred fifty-two".