645261624245 has 16 divisors (see below), whose sum is σ = 885000305280. Its totient is φ = 442430074944.

The previous prime is 645261624239. The next prime is 645261624251. The reversal of 645261624245 is 542426162546.

It is a happy number.

645261624245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645261624239) and next prime (645261624251).

It is a cyclic number.

It is not a de Polignac number, because 645261624245 - 2⁴ = 645261624229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645261624245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277742 + ... + 1169471.

It is an arithmetic number, because the mean of its divisors is an integer number (55312519080).

Almost surely, 2^645261624245 is an apocalyptic number.

It is an amenable number.

645261624245 is a deficient number, since it is larger than the sum of its proper divisors (239738681035).

645261624245 is a wasteful number, since it uses less digits than its factorization.

645261624245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459964.

The product of its digits is 2764800, while the sum is 47.

The spelling of 645261624245 in words is "six hundred forty-five billion, two hundred sixty-one million, six hundred twenty-four thousand, two hundred forty-five".