646020455663 has 4 divisors (see below), whose sum is σ = 704749588008. Its totient is φ = 587291323320.

The previous prime is 646020455611. The next prime is 646020455681. The reversal of 646020455663 is 366554020646.

It is a happy number.

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 646020455663 - 2⁶ = 646020455599 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 (646020455683) 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, 29364566156 + ... + 29364566177.

It is an arithmetic number, because the mean of its divisors is an integer number (176187397002).

Almost surely, 2^646020455663 is an apocalyptic number.

646020455663 is a deficient number, since it is larger than the sum of its proper divisors (58729132345).

646020455663 is a wasteful number, since it uses less digits than its factorization.

646020455663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58729132344.

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 646020455663 in words is "six hundred forty-six billion, twenty million, four hundred fifty-five thousand, six hundred sixty-three".