685116199 has 2 divisors, whose sum is σ = 685116200. Its totient is φ = 685116198.

The previous prime is 685116181. The next prime is 685116209. The reversal of 685116199 is 991611586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685116199 - 2¹⁵ = 685083431 is a prime.

It is a super-2 number, since 2×685116199² = 938768412264415202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685116149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342558099 + 342558100.

It is an arithmetic number, because the mean of its divisors is an integer number (342558100).

Almost surely, 2^685116199 is an apocalyptic number.

685116199 is a deficient number, since it is larger than the sum of its proper divisors (1).

685116199 is an equidigital number, since it uses as much as digits as its factorization.

685116199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 46.

The square root of 685116199 is about 26174.7244302591. The cubic root of 685116199 is about 881.5658240341.

The spelling of 685116199 in words is "six hundred eighty-five million, one hundred sixteen thousand, one hundred ninety-nine".