686615143 has 4 divisors (see below), whose sum is σ = 688528080. Its totient is φ = 684702208.

The previous prime is 686615123. The next prime is 686615173. The reversal of 686615143 is 341516686.

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 686615143 - 2²¹ = 684517991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686615096 and 686615105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686615123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955930 + ... + 956647.

It is an arithmetic number, because the mean of its divisors is an integer number (172132020).

Almost surely, 2^686615143 is an apocalyptic number.

686615143 is a deficient number, since it is larger than the sum of its proper divisors (1912937).

686615143 is a wasteful number, since it uses less digits than its factorization.

686615143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912936.

The product of its digits is 103680, while the sum is 40.

The square root of 686615143 is about 26203.3422104891. The cubic root of 686615143 is about 882.2082723653.

The spelling of 686615143 in words is "six hundred eighty-six million, six hundred fifteen thousand, one hundred forty-three".