663645241 has 16 divisors (see below), whose sum is σ = 784503808. Its totient is φ = 549374400.

The previous prime is 663645233. The next prime is 663645313. The reversal of 663645241 is 142546366.

It is a cyclic number.

It is not a de Polignac number, because 663645241 - 2³ = 663645233 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 663645241.

It is not an unprimeable number, because it can be changed into a prime (663645211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114571 + ... + 120223.

It is an arithmetic number, because the mean of its divisors is an integer number (49031488).

Almost surely, 2^663645241 is an apocalyptic number.

It is an amenable number.

663645241 is a deficient number, since it is larger than the sum of its proper divisors (120858567).

663645241 is a wasteful number, since it uses less digits than its factorization.

663645241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232.

The product of its digits is 103680, while the sum is 37.

The square root of 663645241 is about 25761.3128741530. The cubic root of 663645241 is about 872.2587367503.

The spelling of 663645241 in words is "six hundred sixty-three million, six hundred forty-five thousand, two hundred forty-one".