685805961 has 8 divisors (see below), whose sum is σ = 914985504. Its totient is φ = 456915200.

The previous prime is 685805951. The next prime is 685805977. The reversal of 685805961 is 169508586.

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 685805961 - 2²³ = 677417353 is a prime.

It is a super-2 number, since 2×685805961² = 940659632286267042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 685805961.

It is not an unprimeable number, because it can be changed into a prime (685805921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66591 + ... + 76196.

It is an arithmetic number, because the mean of its divisors is an integer number (114373188).

Almost surely, 2^685805961 is an apocalyptic number.

It is an amenable number.

685805961 is a deficient number, since it is larger than the sum of its proper divisors (229179543).

685805961 is a wasteful number, since it uses less digits than its factorization.

685805961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144391.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 685805961 is about 26187.8972237177. The cubic root of 685805961 is about 881.8615727242.

The spelling of 685805961 in words is "six hundred eighty-five million, eight hundred five thousand, nine hundred sixty-one".