646130663 has 4 divisors (see below), whose sum is σ = 680137560. Its totient is φ = 612123768.

The previous prime is 646130623. The next prime is 646130671. The reversal of 646130663 is 366031646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366031646 = 2 ⋅183015823.

It is a cyclic number.

It is not a de Polignac number, because 646130663 - 2¹² = 646126567 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 (646130623) 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, 17003420 + ... + 17003457.

It is an arithmetic number, because the mean of its divisors is an integer number (170034390).

Almost surely, 2^646130663 is an apocalyptic number.

646130663 is a deficient number, since it is larger than the sum of its proper divisors (34006897).

646130663 is a wasteful number, since it uses less digits than its factorization.

646130663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34006896.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 646130663 is about 25419.1003578018. The cubic root of 646130663 is about 864.5168263970.

The spelling of 646130663 in words is "six hundred forty-six million, one hundred thirty thousand, six hundred sixty-three".