686933309545 has 16 divisors (see below), whose sum is σ = 942720473088. Its totient is φ = 470719730880.

The previous prime is 686933309507. The next prime is 686933309591. The reversal of 686933309545 is 545903339686.

It is a happy number.

It is not a de Polignac number, because 686933309545 - 2¹⁷ = 686933178473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6619714 + ... + 6722683.

It is an arithmetic number, because the mean of its divisors is an integer number (58920029568).

Almost surely, 2^686933309545 is an apocalyptic number.

It is an amenable number.

686933309545 is a deficient number, since it is larger than the sum of its proper divisors (255787163543).

686933309545 is a wasteful number, since it uses less digits than its factorization.

686933309545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13343880.

The product of its (nonzero) digits is 62985600, while the sum is 61.

The spelling of 686933309545 in words is "six hundred eighty-six billion, nine hundred thirty-three million, three hundred nine thousand, five hundred forty-five".