685416517 has 4 divisors (see below), whose sum is σ = 701356480. Its totient is φ = 669476556.

The previous prime is 685416503. The next prime is 685416521. The reversal of 685416517 is 715614586.

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 685416517 - 2²³ = 677027909 is a prime.

It is a super-2 number, since 2×685416517² = 939591603552822578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 15939919 = 685416517 / (6 + 8 + 5 + 4 + 1 + 6 + 5 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685416547) 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, 7969917 + ... + 7970002.

It is an arithmetic number, because the mean of its divisors is an integer number (175339120).

Almost surely, 2^685416517 is an apocalyptic number.

It is an amenable number.

685416517 is a deficient number, since it is larger than the sum of its proper divisors (15939963).

685416517 is a wasteful number, since it uses less digits than its factorization.

685416517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15939962.

The product of its digits is 201600, while the sum is 43.

The square root of 685416517 is about 26180.4605956427. The cubic root of 685416517 is about 881.6946155252.

The spelling of 685416517 in words is "six hundred eighty-five million, four hundred sixteen thousand, five hundred seventeen".