663945763 has 4 divisors (see below), whose sum is σ = 715018528. Its totient is φ = 612873000.

The previous prime is 663945743. The next prime is 663945767. The reversal of 663945763 is 367549366.

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 663945763 - 2²¹ = 661848611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663945767) 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, 25536363 + ... + 25536388.

It is an arithmetic number, because the mean of its divisors is an integer number (178754632).

Almost surely, 2^663945763 is an apocalyptic number.

663945763 is a deficient number, since it is larger than the sum of its proper divisors (51072765).

663945763 is a wasteful number, since it uses less digits than its factorization.

663945763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51072764.

The product of its digits is 2449440, while the sum is 49.

The square root of 663945763 is about 25767.1450300572. The cubic root of 663945763 is about 872.3903800672.

The spelling of 663945763 in words is "six hundred sixty-three million, nine hundred forty-five thousand, seven hundred sixty-three".