687699315985 has 16 divisors (see below), whose sum is σ = 900322708032. Its totient is φ = 500110632000.

The previous prime is 687699315971. The next prime is 687699316001. The reversal of 687699315985 is 589513996786.

It is not a de Polignac number, because 687699315985 - 2⁹ = 687699315473 is a prime.

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, 393835 + ... + 1237135.

It is an arithmetic number, because the mean of its divisors is an integer number (56270169252).

Almost surely, 2^687699315985 is an apocalyptic number.

It is an amenable number.

687699315985 is a deficient number, since it is larger than the sum of its proper divisors (212623392047).

687699315985 is a wasteful number, since it uses less digits than its factorization.

687699315985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858144.

The product of its digits is 881798400, while the sum is 76.

The spelling of 687699315985 in words is "six hundred eighty-seven billion, six hundred ninety-nine million, three hundred fifteen thousand, nine hundred eighty-five".