685156924663 has 4 divisors (see below), whose sum is σ = 685405803888. Its totient is φ = 684908045440.

The previous prime is 685156924643. The next prime is 685156924693. The reversal of 685156924663 is 366429651586.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685156924663 is a prime.

It is a super-2 number, since 2×685156924663² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685156924633) 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, 124435483 + ... + 124440988.

It is an arithmetic number, because the mean of its divisors is an integer number (171351450972).

Almost surely, 2^685156924663 is an apocalyptic number.

685156924663 is a deficient number, since it is larger than the sum of its proper divisors (248879225).

685156924663 is a wasteful number, since it uses less digits than its factorization.

685156924663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248879224.

The product of its digits is 55987200, while the sum is 61.

The spelling of 685156924663 in words is "six hundred eighty-five billion, one hundred fifty-six million, nine hundred twenty-four thousand, six hundred sixty-three".