685416977 has 4 divisors (see below), whose sum is σ = 783333696. Its totient is φ = 587500260.

The previous prime is 685416973. The next prime is 685416989. The reversal of 685416977 is 779614586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 685416977 - 2² = 685416973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685416973) 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, 48958349 + ... + 48958362.

It is an arithmetic number, because the mean of its divisors is an integer number (195833424).

Almost surely, 2^685416977 is an apocalyptic number.

It is an amenable number.

685416977 is a deficient number, since it is larger than the sum of its proper divisors (97916719).

685416977 is an equidigital number, since it uses as much as digits as its factorization.

685416977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97916718.

The product of its digits is 2540160, while the sum is 53.

The square root of 685416977 is about 26180.4693808190. The cubic root of 685416977 is about 881.6948127675.

The spelling of 685416977 in words is "six hundred eighty-five million, four hundred sixteen thousand, nine hundred seventy-seven".