663605447 has 4 divisors (see below), whose sum is σ = 667312920. Its totient is φ = 659897976.

The previous prime is 663605443. The next prime is 663605461. The reversal of 663605447 is 744506366.

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 663605447 - 2² = 663605443 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 (663605443) 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, 1853468 + ... + 1853825.

It is an arithmetic number, because the mean of its divisors is an integer number (166828230).

Almost surely, 2^663605447 is an apocalyptic number.

663605447 is a deficient number, since it is larger than the sum of its proper divisors (3707473).

663605447 is a wasteful number, since it uses less digits than its factorization.

663605447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707472.

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 663605447 is about 25760.5405028699. The cubic root of 663605447 is about 872.2413020548.

The spelling of 663605447 in words is "six hundred sixty-three million, six hundred five thousand, four hundred forty-seven".