686142805031 has 4 divisors (see below), whose sum is σ = 686181148512. Its totient is φ = 686104461552.

The previous prime is 686142805027. The next prime is 686142805039. The reversal of 686142805031 is 130508241686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686142805031 - 2² = 686142805027 is a prime.

It is a super-2 number, since 2×686142805031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686142805039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19144886 + ... + 19180691.

It is an arithmetic number, because the mean of its divisors is an integer number (171545287128).

Almost surely, 2^686142805031 is an apocalyptic number.

686142805031 is a deficient number, since it is larger than the sum of its proper divisors (38343481).

686142805031 is a wasteful number, since it uses less digits than its factorization.

686142805031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38343480.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 686142805031 in words is "six hundred eighty-six billion, one hundred forty-two million, eight hundred five thousand, thirty-one".