645521498312 has 16 divisors (see below), whose sum is σ = 1210591097100. Its totient is φ = 322697205760.

The previous prime is 645521498299. The next prime is 645521498359. The reversal of 645521498312 is 213894125546.

It can be written as a sum of positive squares in 2 ways, for example, as 614709313156 + 30812185156 = 784034^2 + 175534^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7899737 + ... + 7981032.

Almost surely, 2^645521498312 is an apocalyptic number.

It is an amenable number.

645521498312 is a deficient number, since it is larger than the sum of its proper divisors (565069598788).

645521498312 is a wasteful number, since it uses less digits than its factorization.

645521498312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15885856 (or 15885852 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The spelling of 645521498312 in words is "six hundred forty-five billion, five hundred twenty-one million, four hundred ninety-eight thousand, three hundred twelve".