686131755 has 8 divisors (see below), whose sum is σ = 1097810832. Its totient is φ = 365936928.

The previous prime is 686131741. The next prime is 686131763. The reversal of 686131755 is 557131686.

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

It is not a de Polignac number, because 686131755 - 2⁷ = 686131627 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22871044 + ... + 22871073.

It is an arithmetic number, because the mean of its divisors is an integer number (137226354).

Almost surely, 2^686131755 is an apocalyptic number.

686131755 is a deficient number, since it is larger than the sum of its proper divisors (411679077).

686131755 is a wasteful number, since it uses less digits than its factorization.

686131755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45742125.

The product of its digits is 151200, while the sum is 42.

The square root of 686131755 is about 26194.1168012972. The cubic root of 686131755 is about 882.0011942024.

The spelling of 686131755 in words is "six hundred eighty-six million, one hundred thirty-one thousand, seven hundred fifty-five".