646353134563 has 4 divisors (see below), whose sum is σ = 646354926648. Its totient is φ = 646351342480.

The previous prime is 646353134543. The next prime is 646353134579. The reversal of 646353134563 is 365431353646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646353134563 - 2²⁵ = 646319580131 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646353134543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145453 + ... + 1146238.

It is an arithmetic number, because the mean of its divisors is an integer number (161588731662).

Almost surely, 2^646353134563 is an apocalyptic number.

646353134563 is a deficient number, since it is larger than the sum of its proper divisors (1792085).

646353134563 is a wasteful number, since it uses less digits than its factorization.

646353134563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792084.

The product of its digits is 6998400, while the sum is 49.

The spelling of 646353134563 in words is "six hundred forty-six billion, three hundred fifty-three million, one hundred thirty-four thousand, five hundred sixty-three".