645818835 has 32 divisors (see below), whose sum is σ = 1125216000. Its totient is φ = 315052416.

The previous prime is 645818827. The next prime is 645818837. The reversal of 645818835 is 538818546.

It is not a de Polignac number, because 645818835 - 2³ = 645818827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645818837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30805 + ... + 47334.

It is an arithmetic number, because the mean of its divisors is an integer number (35163000).

Almost surely, 2^645818835 is an apocalyptic number.

645818835 is a deficient number, since it is larger than the sum of its proper divisors (479397165).

645818835 is a wasteful number, since it uses less digits than its factorization.

645818835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78195.

The product of its digits is 921600, while the sum is 48.

The square root of 645818835 is about 25412.9658835800. The cubic root of 645818835 is about 864.3777296955.

The spelling of 645818835 in words is "six hundred forty-five million, eight hundred eighteen thousand, eight hundred thirty-five".