646575575647 has 16 divisors (see below), whose sum is σ = 689620290912. Its totient is φ = 604103802880.

The previous prime is 646575575641. The next prime is 646575575651. The reversal of 646575575647 is 746575575646.

646575575647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 646575575647 - 2¹¹ = 646575573599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646575575641) 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, 1027572 + ... + 1532662.

It is an arithmetic number, because the mean of its divisors is an integer number (43101268182).

Almost surely, 2^646575575647 is an apocalyptic number.

646575575647 is a deficient number, since it is larger than the sum of its proper divisors (43044715265).

646575575647 is a wasteful number, since it uses less digits than its factorization.

646575575647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505658.

The product of its digits is 740880000, while the sum is 67.

Subtracting 646575575647 from its reverse (746575575646), we obtain a palindrome (99999999999).

The spelling of 646575575647 in words is "six hundred forty-six billion, five hundred seventy-five million, five hundred seventy-five thousand, six hundred forty-seven".