699643598661 has 36 divisors (see below), whose sum is σ = 1195516951200. Its totient is φ = 393020118288.

The previous prime is 699643598627. The next prime is 699643598669. The reversal of 699643598661 is 166895346996.

It is not a de Polignac number, because 699643598661 - 2²⁹ = 699106727749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 699643598661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699643598669) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13418841 + ... + 13470878.

It is an arithmetic number, because the mean of its divisors is an integer number (33208804200).

Almost surely, 2^699643598661 is an apocalyptic number.

It is an amenable number.

699643598661 is a deficient number, since it is larger than the sum of its proper divisors (495873352539).

699643598661 is a wasteful number, since it uses less digits than its factorization.

699643598661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26889798 (or 26889788 counting only the distinct ones).

The product of its digits is 453496320, while the sum is 72.

The spelling of 699643598661 in words is "six hundred ninety-nine billion, six hundred forty-three million, five hundred ninety-eight thousand, six hundred sixty-one".