697665866689 has 12 divisors (see below), whose sum is σ = 769473164628. Its totient is φ = 632077017440.

The previous prime is 697665866617. The next prime is 697665866699. The reversal of 697665866689 is 986668566796.

It can be written as a sum of positive squares in 2 ways, for example, as 607300697025 + 90365169664 = 779295^2 + 300608^2 .

It is not a de Polignac number, because 697665866689 - 2⁷ = 697665866561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (697665866699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9803854 + ... + 9874759.

It is an arithmetic number, because the mean of its divisors is an integer number (64122763719).

Almost surely, 2^697665866689 is an apocalyptic number.

It is an amenable number.

697665866689 is a deficient number, since it is larger than the sum of its proper divisors (71807297939).

697665866689 is a wasteful number, since it uses less digits than its factorization.

697665866689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19678928 (or 19678917 counting only the distinct ones).

The product of its digits is 8465264640, while the sum is 82.

The spelling of 697665866689 in words is "six hundred ninety-seven billion, six hundred sixty-five million, eight hundred sixty-six thousand, six hundred eighty-nine".