645630170365 has 8 divisors (see below), whose sum is σ = 774833209560. Its totient is φ = 516452799552.

The previous prime is 645630170329. The next prime is 645630170399. The reversal of 645630170365 is 563071036546.

It can be written as a sum of positive squares in 4 ways, for example, as 45239076 + 645584931289 = 6726^2 + 803483^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645630170365 is a prime.

It is a congruent 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, 6361714 + ... + 6462403.

It is an arithmetic number, because the mean of its divisors is an integer number (96854151195).

Almost surely, 2^645630170365 is an apocalyptic number.

It is an amenable number.

645630170365 is a deficient number, since it is larger than the sum of its proper divisors (129203039195).

645630170365 is a wasteful number, since it uses less digits than its factorization.

645630170365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12834191.

The product of its (nonzero) digits is 1360800, while the sum is 46.

The spelling of 645630170365 in words is "six hundred forty-five billion, six hundred thirty million, one hundred seventy thousand, three hundred sixty-five".