691994622685 has 32 divisors (see below), whose sum is σ = 882861557760. Its totient is φ = 519204437568.

The previous prime is 691994622679. The next prime is 691994622749. The reversal of 691994622685 is 586226499196.

It is a cyclic number.

It is not a de Polignac number, because 691994622685 - 2⁹ = 691994622173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 691994622685.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 37790302 + ... + 37808608.

It is an arithmetic number, because the mean of its divisors is an integer number (27589423680).

Almost surely, 2^691994622685 is an apocalyptic number.

It is an amenable number.

691994622685 is a deficient number, since it is larger than the sum of its proper divisors (190866935075).

691994622685 is a wasteful number, since it uses less digits than its factorization.

691994622685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22297.

The product of its digits is 100776960, while the sum is 67.

The spelling of 691994622685 in words is "six hundred ninety-one billion, nine hundred ninety-four million, six hundred twenty-two thousand, six hundred eighty-five".