685377767 has 2 divisors, whose sum is σ = 685377768. Its totient is φ = 685377766.

The previous prime is 685377743. The next prime is 685377769. The reversal of 685377767 is 767773586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685377767 - 2⁶ = 685377703 is a prime.

Together with 685377769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685377769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342688883 + 342688884.

It is an arithmetic number, because the mean of its divisors is an integer number (342688884).

Almost surely, 2^685377767 is an apocalyptic number.

685377767 is a deficient number, since it is larger than the sum of its proper divisors (1).

685377767 is an equidigital number, since it uses as much as digits as its factorization.

685377767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10372320, while the sum is 56.

The square root of 685377767 is about 26179.7205294480. The cubic root of 685377767 is about 881.6779996868.

The spelling of 685377767 in words is "six hundred eighty-five million, three hundred seventy-seven thousand, seven hundred sixty-seven".