663642441 has 48 divisors (see below), whose sum is σ = 1224332928. Its totient is φ = 336326400.

The previous prime is 663642407. The next prime is 663642449. The reversal of 663642441 is 144246366.

663642441 is a `hidden beast` number, since 6 + 6 + 3 + 642 + 4 + 4 + 1 = 666.

It is not a de Polignac number, because 663642441 - 2⁷ = 663642313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663642396 and 663642405.

It is not an unprimeable number, because it can be changed into a prime (663642449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16735 + ... + 40091.

It is an arithmetic number, because the mean of its divisors is an integer number (25506936).

Almost surely, 2^663642441 is an apocalyptic number.

It is an amenable number.

663642441 is a deficient number, since it is larger than the sum of its proper divisors (560690487).

663642441 is a wasteful number, since it uses less digits than its factorization.

663642441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23422 (or 23419 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 663642441 is about 25761.2585290393. The cubic root of 663642441 is about 872.2575100266.

The spelling of 663642441 in words is "six hundred sixty-three million, six hundred forty-two thousand, four hundred forty-one".