686670755 has 8 divisors (see below), whose sum is σ = 824219952. Its totient is φ = 549193248.

The previous prime is 686670737. The next prime is 686670757. The reversal of 686670755 is 557076686.

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 686670755 - 2⁸ = 686670499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686670757) 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, 6077 + ... + 37553.

It is an arithmetic number, because the mean of its divisors is an integer number (103027494).

Almost surely, 2^686670755 is an apocalyptic number.

686670755 is a deficient number, since it is larger than the sum of its proper divisors (137549197).

686670755 is a wasteful number, since it uses less digits than its factorization.

686670755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35845.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The square root of 686670755 is about 26204.4033513454. The cubic root of 686670755 is about 882.2320897067.

The spelling of 686670755 in words is "six hundred eighty-six million, six hundred seventy thousand, seven hundred fifty-five".