663441641 has 4 divisors (see below), whose sum is σ = 663555984. Its totient is φ = 663327300.

The previous prime is 663441631. The next prime is 663441697. The reversal of 663441641 is 146144366.

It is a happy number.

663441641 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663441641 - 2⁶ = 663441577 is a prime.

It is a super-2 number, since 2×663441641² = 880309622025545762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663441631) 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, 47975 + ... + 60236.

It is an arithmetic number, because the mean of its divisors is an integer number (165888996).

Almost surely, 2^663441641 is an apocalyptic number.

It is an amenable number.

663441641 is a deficient number, since it is larger than the sum of its proper divisors (114343).

663441641 is a wasteful number, since it uses less digits than its factorization.

663441641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114342.

The product of its digits is 41472, while the sum is 35.

The square root of 663441641 is about 25757.3609090683. The cubic root of 663441641 is about 872.1695274197.

The spelling of 663441641 in words is "six hundred sixty-three million, four hundred forty-one thousand, six hundred forty-one".