686357425408 has 36 divisors (see below), whose sum is σ = 1370508162660. Its totient is φ = 343059881984.

The previous prime is 686357425387. The next prime is 686357425469. The reversal of 686357425408 is 804524753686.

It can be written as a sum of positive squares in 2 ways, for example, as 455311853824 + 231045571584 = 674768^2 + 480672^2 .

It is a congruent number.

It is an unprimeable number.

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, 278898 + ... + 1204366.

It is an arithmetic number, because the mean of its divisors is an integer number (38069671185).

Almost surely, 2^686357425408 is an apocalyptic number.

It is an amenable number.

686357425408 is a deficient number, since it is larger than the sum of its proper divisors (684150737252).

686357425408 is an equidigital number, since it uses as much as digits as its factorization.

686357425408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928382 (or 928368 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 58.

The spelling of 686357425408 in words is "six hundred eighty-six billion, three hundred fifty-seven million, four hundred twenty-five thousand, four hundred eight".