685316623 has 2 divisors, whose sum is σ = 685316624. Its totient is φ = 685316622.

The previous prime is 685316617. The next prime is 685316629. The reversal of 685316623 is 326613586.

It is a balanced prime because it is at equal distance from previous prime (685316617) and next prime (685316629).

It is a cyclic number.

It is not a de Polignac number, because 685316623 - 2⁵ = 685316591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685316629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342658311 + 342658312.

It is an arithmetic number, because the mean of its divisors is an integer number (342658312).

Almost surely, 2^685316623 is an apocalyptic number.

685316623 is a deficient number, since it is larger than the sum of its proper divisors (1).

685316623 is an equidigital number, since it uses as much as digits as its factorization.

685316623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 685316623 is about 26178.5527292859. The cubic root of 685316623 is about 881.6517801208.

The spelling of 685316623 in words is "six hundred eighty-five million, three hundred sixteen thousand, six hundred twenty-three".