686804343615 has 24 divisors (see below), whose sum is σ = 1282034775840. Its totient is φ = 338119061184.

The previous prime is 686804343611. The next prime is 686804343671. The reversal of 686804343615 is 516343408686.

686804343615 is a `hidden beast` number, since 6 + 86 + 80 + 43 + 436 + 15 = 666.

It is not a de Polignac number, because 686804343615 - 2² = 686804343611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686804343611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 587011675 + ... + 587012844.

It is an arithmetic number, because the mean of its divisors is an integer number (53418115660).

Almost surely, 2^686804343615 is an apocalyptic number.

686804343615 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

686804343615 is a deficient number, since it is larger than the sum of its proper divisors (595230432225).

686804343615 is a wasteful number, since it uses less digits than its factorization.

686804343615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174024543 (or 1174024540 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 54.

The spelling of 686804343615 in words is "six hundred eighty-six billion, eight hundred four million, three hundred forty-three thousand, six hundred fifteen".