685996699507 has 6 divisors (see below), whose sum is σ = 797996160708. Its totient is φ = 587997170964.

The previous prime is 685996699471. The next prime is 685996699519. The reversal of 685996699507 is 705996699586.

It is not a de Polignac number, because 685996699507 - 2¹⁹ = 685996175219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685996699547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6999966273 + ... + 6999966370.

It is an arithmetic number, because the mean of its divisors is an integer number (132999360118).

Almost surely, 2^685996699507 is an apocalyptic number.

685996699507 is a deficient number, since it is larger than the sum of its proper divisors (111999461201).

685996699507 is a wasteful number, since it uses less digits than its factorization.

685996699507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13999932657 (or 13999932650 counting only the distinct ones).

The product of its (nonzero) digits is 1984046400, while the sum is 79.

Adding to 685996699507 its sum of digits (79), we get a palindrome (685996699586).

The spelling of 685996699507 in words is "six hundred eighty-five billion, nine hundred ninety-six million, six hundred ninety-nine thousand, five hundred seven".