663645245 has 8 divisors (see below), whose sum is σ = 804259800. Its totient is φ = 525659200.

The previous prime is 663645233. The next prime is 663645313. The reversal of 663645245 is 542546366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 366875716 + 296769529 = 19154^2 + 17227^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663645245 - 2⁶ = 663645181 is a prime.

It is a super-2 number, since 2×663645245² = 880850022422220050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656570 + ... + 657579.

It is an arithmetic number, because the mean of its divisors is an integer number (100532475).

Almost surely, 2^663645245 is an apocalyptic number.

It is an amenable number.

663645245 is a deficient number, since it is larger than the sum of its proper divisors (140614555).

663645245 is a wasteful number, since it uses less digits than its factorization.

663645245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314255.

The product of its digits is 518400, while the sum is 41.

The square root of 663645245 is about 25761.3129517888. The cubic root of 663645245 is about 872.2587385027.

The spelling of 663645245 in words is "six hundred sixty-three million, six hundred forty-five thousand, two hundred forty-five".