647273315985 has 16 divisors (see below), whose sum is σ = 1063627503936. Its totient is φ = 335882369088.

The previous prime is 647273315981. The next prime is 647273315999. The reversal of 647273315985 is 589513372746.

It is a happy number.

It is not a de Polignac number, because 647273315985 - 2² = 647273315981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (647273315981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 583128559 + ... + 583129668.

It is an arithmetic number, because the mean of its divisors is an integer number (66476718996).

Almost surely, 2^647273315985 is an apocalyptic number.

It is an amenable number.

647273315985 is a deficient number, since it is larger than the sum of its proper divisors (416354187951).

647273315985 is a wasteful number, since it uses less digits than its factorization.

647273315985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166258272.

The product of its digits is 38102400, while the sum is 60.

The spelling of 647273315985 in words is "six hundred forty-seven billion, two hundred seventy-three million, three hundred fifteen thousand, nine hundred eighty-five".