645814645 has 16 divisors (see below), whose sum is σ = 893819520. Its totient is φ = 438778944.

The previous prime is 645814643. The next prime is 645814667. The reversal of 645814645 is 546418546.

It is a cyclic number.

It is not a de Polignac number, because 645814645 - 2¹ = 645814643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645814643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80827 + ... + 88456.

It is an arithmetic number, because the mean of its divisors is an integer number (55863720).

Almost surely, 2^645814645 is an apocalyptic number.

It is an amenable number.

645814645 is a deficient number, since it is larger than the sum of its proper divisors (248004875).

645814645 is a wasteful number, since it uses less digits than its factorization.

645814645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169404.

The product of its digits is 460800, while the sum is 43.

The square root of 645814645 is about 25412.8834452134. The cubic root of 645814645 is about 864.3758603629.

The spelling of 645814645 in words is "six hundred forty-five million, eight hundred fourteen thousand, six hundred forty-five".