685816601 has 8 divisors (see below), whose sum is σ = 726685344. Its totient is φ = 645006400.

The previous prime is 685816597. The next prime is 685816643. The reversal of 685816601 is 106618586.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685816601 - 2² = 685816597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (685816801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10766 + ... + 38568.

It is an arithmetic number, because the mean of its divisors is an integer number (90835668).

Almost surely, 2^685816601 is an apocalyptic number.

It is an amenable number.

685816601 is a deficient number, since it is larger than the sum of its proper divisors (40868743).

685816601 is a wasteful number, since it uses less digits than its factorization.

685816601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29271.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 685816601 is about 26188.1003702063. The cubic root of 685816601 is about 881.8661332749.

The spelling of 685816601 in words is "six hundred eighty-five million, eight hundred sixteen thousand, six hundred one".