646574343475647 has 16 divisors (see below), whose sum is σ = 865282943554560. Its totient is φ = 429457662568800.

The previous prime is 646574343475637. The next prime is 646574343475651. The reversal of 646574343475647 is 746574343475646.

It is not a de Polignac number, because 646574343475647 - 2⁴ = 646574343475631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646574343475607) 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, 316343197 + ... + 318380537.

It is an arithmetic number, because the mean of its divisors is an integer number (54080183972160).

Almost surely, 2^{646574343475647} is an apocalyptic number.

646574343475647 is a deficient number, since it is larger than the sum of its proper divisors (218708600078913).

646574343475647 is a wasteful number, since it uses less digits than its factorization.

646574343475647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427974.

The product of its digits is 17069875200, while the sum is 75.

Subtracting 646574343475647 from its reverse (746574343475646), we obtain a palindrome (99999999999999).

The spelling of 646574343475647 in words is "six hundred forty-six trillion, five hundred seventy-four billion, three hundred forty-three million, four hundred seventy-five thousand, six hundred forty-seven".