645202303015 has 4 divisors (see below), whose sum is σ = 774242763624. Its totient is φ = 516161842408.

The previous prime is 645202302971. The next prime is 645202303037. The reversal of 645202303015 is 510303202546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645202303015 - 2²¹ = 645200205863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64520230297 + ... + 64520230306.

It is an arithmetic number, because the mean of its divisors is an integer number (193560690906).

Almost surely, 2^645202303015 is an apocalyptic number.

645202303015 is a deficient number, since it is larger than the sum of its proper divisors (129040460609).

645202303015 is a wasteful number, since it uses less digits than its factorization.

645202303015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129040460608.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 645202303015 in words is "six hundred forty-five billion, two hundred two million, three hundred three thousand, fifteen".