646252863 has 16 divisors (see below), whose sum is σ = 877132800. Its totient is φ = 423150560.

The previous prime is 646252861. The next prime is 646252889. The reversal of 646252863 is 368252646.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 646252863 - 2¹ = 646252861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646252861) 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, 51658 + ... + 62936.

It is an arithmetic number, because the mean of its divisors is an integer number (54820800).

Almost surely, 2^646252863 is an apocalyptic number.

646252863 is a deficient number, since it is larger than the sum of its proper divisors (230879937).

646252863 is a wasteful number, since it uses less digits than its factorization.

646252863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11622.

The product of its digits is 414720, while the sum is 42.

The square root of 646252863 is about 25421.5039484292. The cubic root of 646252863 is about 864.5713237832.

The spelling of 646252863 in words is "six hundred forty-six million, two hundred fifty-two thousand, eight hundred sixty-three".