647894856875 has 20 divisors (see below), whose sum is σ = 925267906992. Its totient is φ = 444270756000.

The previous prime is 647894856853. The next prime is 647894856893. The reversal of 647894856875 is 578658498746.

It is not a de Polignac number, because 647894856875 - 2¹² = 647894852779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647894856796 and 647894856805.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74040752 + ... + 74049501.

Almost surely, 2^647894856875 is an apocalyptic number.

647894856875 is a deficient number, since it is larger than the sum of its proper divisors (277373050117).

647894856875 is an equidigital number, since it uses as much as digits as its factorization.

647894856875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148090280 (or 148090265 counting only the distinct ones).

The product of its digits is 3251404800, while the sum is 77.

The spelling of 647894856875 in words is "six hundred forty-seven billion, eight hundred ninety-four million, eight hundred fifty-six thousand, eight hundred seventy-five".