685432647499 has 4 divisors (see below), whose sum is σ = 685450164664. Its totient is φ = 685415130336.

The previous prime is 685432647479. The next prime is 685432647503. The reversal of 685432647499 is 994746234586.

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 685432647499 - 2⁷ = 685432647371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685432647479) 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, 8699757 + ... + 8778190.

It is an arithmetic number, because the mean of its divisors is an integer number (171362541166).

Almost surely, 2^685432647499 is an apocalyptic number.

685432647499 is a deficient number, since it is larger than the sum of its proper divisors (17517165).

685432647499 is a wasteful number, since it uses less digits than its factorization.

685432647499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17517164.

The product of its digits is 313528320, while the sum is 67.

The spelling of 685432647499 in words is "six hundred eighty-five billion, four hundred thirty-two million, six hundred forty-seven thousand, four hundred ninety-nine".