647317236985 has 16 divisors (see below), whose sum is σ = 810581043456. Its totient is φ = 495321732928.

The previous prime is 647317236967. The next prime is 647317237001. The reversal of 647317236985 is 589632713746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 647317236985 - 2¹⁷ = 647317105913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4165707 + ... + 4318303.

It is an arithmetic number, because the mean of its divisors is an integer number (50661315216).

Almost surely, 2^647317236985 is an apocalyptic number.

It is an amenable number.

647317236985 is a deficient number, since it is larger than the sum of its proper divisors (163263806471).

647317236985 is a wasteful number, since it uses less digits than its factorization.

647317236985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189512.

The product of its digits is 45722880, while the sum is 61.

The spelling of 647317236985 in words is "six hundred forty-seven billion, three hundred seventeen million, two hundred thirty-six thousand, nine hundred eighty-five".