645063305 has 8 divisors (see below), whose sum is σ = 774381192. Its totient is φ = 515847168.

The previous prime is 645063271. The next prime is 645063323. The reversal of 645063305 is 503360546.

It can be written as a sum of positive squares in 4 ways, for example, as 10426441 + 634636864 = 3229^2 + 25192^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 645063305 - 2⁶ = 645063241 is a prime.

It is a super-2 number, since 2×645063305² = 832213334915046050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10712 + ... + 37481.

It is an arithmetic number, because the mean of its divisors is an integer number (96797649).

Almost surely, 2^645063305 is an apocalyptic number.

It is an amenable number.

645063305 is a deficient number, since it is larger than the sum of its proper divisors (129317887).

645063305 is a wasteful number, since it uses less digits than its factorization.

645063305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50875.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 645063305 is about 25398.0964837919. The cubic root of 645063305 is about 864.0405256661.

The spelling of 645063305 in words is "six hundred forty-five million, sixty-three thousand, three hundred five".