645442652616 has 16 divisors (see below), whose sum is σ = 1613606631600. Its totient is φ = 215147550864.

The previous prime is 645442652587. The next prime is 645442652627. The reversal of 645442652616 is 616256244546.

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 3 ways as a sum of consecutive naturals, for example, 13446721906 + ... + 13446721953.

It is an arithmetic number, because the mean of its divisors is an integer number (100850414475).

Almost surely, 2^645442652616 is an apocalyptic number.

It is an amenable number.

645442652616 is an abundant number, since it is smaller than the sum of its proper divisors (968163978984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645442652616 is a wasteful number, since it uses less digits than its factorization.

645442652616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26893443868 (or 26893443864 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 51.

The spelling of 645442652616 in words is "six hundred forty-five billion, four hundred forty-two million, six hundred fifty-two thousand, six hundred sixteen".