645236611 has 4 divisors (see below), whose sum is σ = 645398424. Its totient is φ = 645074800.

The previous prime is 645236593. The next prime is 645236617. The reversal of 645236611 is 116632546.

645236611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645236611 - 2⁹ = 645236099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645236617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74770 + ... + 82951.

It is an arithmetic number, because the mean of its divisors is an integer number (161349606).

Almost surely, 2^645236611 is an apocalyptic number.

645236611 is a deficient number, since it is larger than the sum of its proper divisors (161813).

645236611 is a wasteful number, since it uses less digits than its factorization.

645236611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161812.

The product of its digits is 25920, while the sum is 34.

The square root of 645236611 is about 25401.5080457834. The cubic root of 645236611 is about 864.1178979167.

The spelling of 645236611 in words is "six hundred forty-five million, two hundred thirty-six thousand, six hundred eleven".