686636061 has 8 divisors (see below), whose sum is σ = 937844544. Its totient is φ = 446592480.

The previous prime is 686636059. The next prime is 686636087. The reversal of 686636061 is 160636686.

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

It is not a de Polignac number, because 686636061 - 2¹ = 686636059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686636021) 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, 2791081 + ... + 2791326.

It is an arithmetic number, because the mean of its divisors is an integer number (117230568).

Almost surely, 2^686636061 is an apocalyptic number.

It is an amenable number.

686636061 is a deficient number, since it is larger than the sum of its proper divisors (251208483).

686636061 is a wasteful number, since it uses less digits than its factorization.

686636061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582451.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 686636061 is about 26203.7413550050. The cubic root of 686636061 is about 882.2172312148.

The spelling of 686636061 in words is "six hundred eighty-six million, six hundred thirty-six thousand, sixty-one".