645633833870 has 32 divisors (see below), whose sum is σ = 1177978425120. Its totient is φ = 254743797760.

The previous prime is 645633833827. The next prime is 645633833917. The reversal of 645633833870 is 78338336546.

It is a happy number.

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, 74735 + ... + 1138794.

It is an arithmetic number, because the mean of its divisors is an integer number (36811825785).

Almost surely, 2^645633833870 is an apocalyptic number.

645633833870 is a deficient number, since it is larger than the sum of its proper divisors (532344591250).

645633833870 is a wasteful number, since it uses less digits than its factorization.

645633833870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214260.

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 645633833870 in words is "six hundred forty-five billion, six hundred thirty-three million, eight hundred thirty-three thousand, eight hundred seventy".