645226409742 has 8 divisors (see below), whose sum is σ = 1290452819496. Its totient is φ = 215075469912.

The previous prime is 645226409683. The next prime is 645226409753. The reversal of 645226409742 is 247904622546.

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

645226409742 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53768867473 + ... + 53768867484.

It is an arithmetic number, because the mean of its divisors is an integer number (161306602437).

Almost surely, 2^645226409742 is an apocalyptic number.

645226409742 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.

645226409742 is a wasteful number, since it uses less digits than its factorization.

645226409742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107537734962.

The product of its (nonzero) digits is 5806080, while the sum is 51.

The spelling of 645226409742 in words is "six hundred forty-five billion, two hundred twenty-six million, four hundred nine thousand, seven hundred forty-two".