685166565 has 8 divisors (see below), whose sum is σ = 1096266528. Its totient is φ = 365422160.

The previous prime is 685166561. The next prime is 685166567. The reversal of 685166565 is 565661586.

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

It is not a de Polignac number, because 685166565 - 2² = 685166561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685166561) 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, 22838871 + ... + 22838900.

It is an arithmetic number, because the mean of its divisors is an integer number (137033316).

Almost surely, 2^685166565 is an apocalyptic number.

It is an amenable number.

685166565 is a deficient number, since it is larger than the sum of its proper divisors (411099963).

685166565 is a wasteful number, since it uses less digits than its factorization.

685166565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45677779.

The product of its digits is 1296000, while the sum is 48.

The square root of 685166565 is about 26175.6865239481. The cubic root of 685166565 is about 881.5874261391.

The spelling of 685166565 in words is "six hundred eighty-five million, one hundred sixty-six thousand, five hundred sixty-five".