641646463 has 4 divisors (see below), whose sum is σ = 662344768. Its totient is φ = 620948160.

The previous prime is 641646457. The next prime is 641646469. The reversal of 641646463 is 364646146.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (641646457) and next prime (641646469).

It is a cyclic number.

It is not a de Polignac number, because 641646463 - 2⁹ = 641645951 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 (641646469) 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, 10349106 + ... + 10349167.

It is an arithmetic number, because the mean of its divisors is an integer number (165586192).

Almost surely, 2^641646463 is an apocalyptic number.

641646463 is a deficient number, since it is larger than the sum of its proper divisors (20698305).

641646463 is a wasteful number, since it uses less digits than its factorization.

641646463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20698304.

The product of its digits is 248832, while the sum is 40.

The square root of 641646463 is about 25330.7414617101. The cubic root of 641646463 is about 862.5122425763.

The spelling of 641646463 in words is "six hundred forty-one million, six hundred forty-six thousand, four hundred sixty-three".