697665866687 has 4 divisors (see below), whose sum is σ = 698479946736. Its totient is φ = 696851786640.

The previous prime is 697665866617. The next prime is 697665866699. The reversal of 697665866687 is 786668566796.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 697665866687 - 2³⁰ = 696592124863 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 (697665866617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407038739 + ... + 407040452.

It is an arithmetic number, because the mean of its divisors is an integer number (174619986684).

Almost surely, 2^697665866687 is an apocalyptic number.

697665866687 is a deficient number, since it is larger than the sum of its proper divisors (814080049).

697665866687 is an equidigital number, since it uses as much as digits as its factorization.

697665866687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814080048.

The product of its digits is 6584094720, while the sum is 80.

The spelling of 697665866687 in words is "six hundred ninety-seven billion, six hundred sixty-five million, eight hundred sixty-six thousand, six hundred eighty-seven".