645254066330 has 16 divisors (see below), whose sum is σ = 1192848058440. Its totient is φ = 251125906752.

The previous prime is 645254066267. The next prime is 645254066411. The reversal of 645254066330 is 33660452546.

It can be written as a sum of positive squares in 4 ways, for example, as 461939074921 + 183314991409 = 679661^2 + 428153^2 .

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, 871964585 + ... + 871965324.

Almost surely, 2^645254066330 is an apocalyptic number.

645254066330 is a deficient number, since it is larger than the sum of its proper divisors (547593992110).

645254066330 is a wasteful number, since it uses less digits than its factorization.

645254066330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743929953.

The product of its (nonzero) digits is 1555200, while the sum is 44.

The spelling of 645254066330 in words is "six hundred forty-five billion, two hundred fifty-four million, sixty-six thousand, three hundred thirty".