645206631306 has 8 divisors (see below), whose sum is σ = 1290413262624. Its totient is φ = 215068877100.

The previous prime is 645206631259. The next prime is 645206631317. The reversal of 645206631306 is 603136602546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

645206631306 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53767219270 + ... + 53767219281.

It is an arithmetic number, because the mean of its divisors is an integer number (161301657828).

Almost surely, 2^645206631306 is an apocalyptic number.

645206631306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645206631306 is a wasteful number, since it uses less digits than its factorization.

645206631306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107534438556.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 645206631306 in words is "six hundred forty-five billion, two hundred six million, six hundred thirty-one thousand, three hundred six".