685256930291 has 4 divisors (see below), whose sum is σ = 685263587400. Its totient is φ = 685250273184.

The previous prime is 685256930287. The next prime is 685256930297. The reversal of 685256930291 is 192039652586.

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 685256930291 - 2² = 685256930287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685256930297) 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, 3171686 + ... + 3380843.

It is an arithmetic number, because the mean of its divisors is an integer number (171315896850).

Almost surely, 2^685256930291 is an apocalyptic number.

685256930291 is a deficient number, since it is larger than the sum of its proper divisors (6657109).

685256930291 is a wasteful number, since it uses less digits than its factorization.

685256930291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6657108.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 685256930291 in words is "six hundred eighty-five billion, two hundred fifty-six million, nine hundred thirty thousand, two hundred ninety-one".