686155720534 has 8 divisors (see below), whose sum is σ = 1038341842920. Its totient is φ = 340041772896.

The previous prime is 686155720517. The next prime is 686155720561. The reversal of 686155720534 is 435027551686.

686155720534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518043404 + ... + 1518043855.

It is an arithmetic number, because the mean of its divisors is an integer number (129792730365).

Almost surely, 2^686155720534 is an apocalyptic number.

686155720534 is a deficient number, since it is larger than the sum of its proper divisors (352186122386).

686155720534 is a wasteful number, since it uses less digits than its factorization.

686155720534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036087374.

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 686155720534 in words is "six hundred eighty-six billion, one hundred fifty-five million, seven hundred twenty thousand, five hundred thirty-four".