686390979803 has 8 divisors (see below), whose sum is σ = 694719453456. Its totient is φ = 678063904000.

The previous prime is 686390979793. The next prime is 686390979811. The reversal of 686390979803 is 308979093686.

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

It is a cyclic number.

It is not a de Polignac number, because 686390979803 - 2⁴ = 686390979787 is a prime.

It is a super-2 number, since 2×686390979803² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686390979103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656003 + ... + 1342803.

It is an arithmetic number, because the mean of its divisors is an integer number (86839931682).

Almost surely, 2^686390979803 is an apocalyptic number.

686390979803 is a deficient number, since it is larger than the sum of its proper divisors (8328473653).

686390979803 is a wasteful number, since it uses less digits than its factorization.

686390979803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698925.

The product of its (nonzero) digits is 105815808, while the sum is 68.

The spelling of 686390979803 in words is "six hundred eighty-six billion, three hundred ninety million, nine hundred seventy-nine thousand, eight hundred three".