663443641 has 8 divisors (see below), whose sum is σ = 758825280. Its totient is φ = 568213008.

The previous prime is 663443623. The next prime is 663443699. The reversal of 663443641 is 146344366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663443641 - 2¹⁹ = 662919353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663443641.

It is not an unprimeable number, because it can be changed into a prime (663443941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28171 + ... + 46048.

It is an arithmetic number, because the mean of its divisors is an integer number (94853160).

Almost surely, 2^663443641 is an apocalyptic number.

It is an amenable number.

663443641 is a deficient number, since it is larger than the sum of its proper divisors (95381639).

663443641 is a wasteful number, since it uses less digits than its factorization.

663443641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75503.

The product of its digits is 124416, while the sum is 37.

The square root of 663443641 is about 25757.3997328923. The cubic root of 663443641 is about 872.1704038280.

The spelling of 663443641 in words is "six hundred sixty-three million, four hundred forty-three thousand, six hundred forty-one".