663912745 has 4 divisors (see below), whose sum is σ = 796695300. Its totient is φ = 531130192.

The previous prime is 663912737. The next prime is 663912749. The reversal of 663912745 is 547219366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 408807961 + 255104784 = 20219^2 + 15972^2 .

It is a cyclic number.

It is not a de Polignac number, because 663912745 - 2³ = 663912737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663912749) 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, 66391270 + ... + 66391279.

It is an arithmetic number, because the mean of its divisors is an integer number (199173825).

Almost surely, 2^663912745 is an apocalyptic number.

It is an amenable number.

663912745 is a deficient number, since it is larger than the sum of its proper divisors (132782555).

663912745 is a wasteful number, since it uses less digits than its factorization.

663912745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132782554.

The product of its digits is 272160, while the sum is 43.

The square root of 663912745 is about 25766.5043224726. The cubic root of 663912745 is about 872.3759185129.

The spelling of 663912745 in words is "six hundred sixty-three million, nine hundred twelve thousand, seven hundred forty-five".