685657723 has 2 divisors, whose sum is σ = 685657724. Its totient is φ = 685657722.

The previous prime is 685657711. The next prime is 685657727. The reversal of 685657723 is 327756586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685657723 - 2¹⁷ = 685526651 is a prime.

It is not a weakly prime, because it can be changed into another prime (685657727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342828861 + 342828862.

It is an arithmetic number, because the mean of its divisors is an integer number (342828862).

Almost surely, 2^685657723 is an apocalyptic number.

685657723 is a deficient number, since it is larger than the sum of its proper divisors (1).

685657723 is an equidigital number, since it uses as much as digits as its factorization.

685657723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 49.

The square root of 685657723 is about 26185.0667938808. The cubic root of 685657723 is about 881.7980295729.

The spelling of 685657723 in words is "six hundred eighty-five million, six hundred fifty-seven thousand, seven hundred twenty-three".