663025009 has 4 divisors (see below), whose sum is σ = 663096816. Its totient is φ = 662953204.

The previous prime is 663024997. The next prime is 663025021. The reversal of 663025009 is 900520366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (663024997) and next prime (663025021).

It is a cyclic number.

It is not a de Polignac number, because 663025009 - 2⁵ = 663024977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663025039) 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, 19579 + ... + 41344.

It is an arithmetic number, because the mean of its divisors is an integer number (165774204).

Almost surely, 2^663025009 is an apocalyptic number.

It is an amenable number.

663025009 is a deficient number, since it is larger than the sum of its proper divisors (71807).

663025009 is a wasteful number, since it uses less digits than its factorization.

663025009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71806.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 663025009 is about 25749.2720091268. The cubic root of 663025009 is about 871.9869191323.

The spelling of 663025009 in words is "six hundred sixty-three million, twenty-five thousand, nine".