646205463 has 12 divisors (see below), whose sum is σ = 965594760. Its totient is φ = 415948176.

The previous prime is 646205431. The next prime is 646205467. The reversal of 646205463 is 364502646.

646205463 is a `hidden beast` number, since 646 + 2 + 0 + 5 + 4 + 6 + 3 = 666.

It is not a de Polignac number, because 646205463 - 2⁵ = 646205431 is a prime.

It is a super-2 number, since 2×646205463² = 835163000822088738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646205467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1237681 + ... + 1238202.

It is an arithmetic number, because the mean of its divisors is an integer number (80466230).

Almost surely, 2^646205463 is an apocalyptic number.

646205463 is a deficient number, since it is larger than the sum of its proper divisors (319389297).

646205463 is a wasteful number, since it uses less digits than its factorization.

646205463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475918 (or 2475915 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 646205463 is about 25420.5716497486. The cubic root of 646205463 is about 864.5501856781.

The spelling of 646205463 in words is "six hundred forty-six million, two hundred five thousand, four hundred sixty-three".