646949563 has 8 divisors (see below), whose sum is σ = 733384400. Its totient is φ = 565753248.

The previous prime is 646949561. The next prime is 646949581. The reversal of 646949563 is 365949646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646949563 - 2¹ = 646949561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646949563.

It is not an unprimeable number, because it can be changed into a prime (646949561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1309368 + ... + 1309861.

It is an arithmetic number, because the mean of its divisors is an integer number (91673050).

Almost surely, 2^646949563 is an apocalyptic number.

646949563 is a deficient number, since it is larger than the sum of its proper divisors (86434837).

646949563 is a wasteful number, since it uses less digits than its factorization.

646949563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619261.

The product of its digits is 4199040, while the sum is 52.

The square root of 646949563 is about 25435.2032230922. The cubic root of 646949563 is about 864.8818990754.

The spelling of 646949563 in words is "six hundred forty-six million, nine hundred forty-nine thousand, five hundred sixty-three".