621443663 has 4 divisors (see below), whose sum is σ = 621563400. Its totient is φ = 621323928.

The previous prime is 621443623. The next prime is 621443743. The reversal of 621443663 is 366344126.

621443663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 621443663 - 2²⁸ = 353008207 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 (621443623) 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, 51713 + ... + 62586.

It is an arithmetic number, because the mean of its divisors is an integer number (155390850).

Almost surely, 2^621443663 is an apocalyptic number.

621443663 is a deficient number, since it is larger than the sum of its proper divisors (119737).

621443663 is a wasteful number, since it uses less digits than its factorization.

621443663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119736.

The product of its digits is 62208, while the sum is 35.

The square root of 621443663 is about 24928.7717908444. The cubic root of 621443663 is about 853.3632208804.

Adding to 621443663 its reverse (366344126), we get a palindrome (987787789).

The spelling of 621443663 in words is "six hundred twenty-one million, four hundred forty-three thousand, six hundred sixty-three".