691475849397 has 12 divisors (see below), whose sum is σ = 1003532093824. Its totient is φ = 458799140520.

The previous prime is 691475849377. The next prime is 691475849399. The reversal of 691475849397 is 793948574196.

691475849397 is a `hidden beast` number, since 6 + 9 + 1 + 4 + 7 + 584 + 9 + 39 + 7 = 666.

It is not a de Polignac number, because 691475849397 - 2¹⁰ = 691475848373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691475849399) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 182061253 + ... + 182065050.

Almost surely, 2^691475849397 is an apocalyptic number.

It is an amenable number.

691475849397 is a deficient number, since it is larger than the sum of its proper divisors (312056244427).

691475849397 is a wasteful number, since it uses less digits than its factorization.

691475849397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364126520 (or 364126517 counting only the distinct ones).

The product of its digits is 411505920, while the sum is 72.

The spelling of 691475849397 in words is "six hundred ninety-one billion, four hundred seventy-five million, eight hundred forty-nine thousand, three hundred ninety-seven".