644810316670 has 32 divisors (see below), whose sum is σ = 1273523785632. Its totient is φ = 233591659392.

The previous prime is 644810316643. The next prime is 644810316697. The reversal of 644810316670 is 76613018446.

644810316670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644810316643) and next prime (644810316697).

It is a self number, because there is not a number n which added to its sum of digits gives 644810316670.

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, 46786312 + ... + 46800091.

It is an arithmetic number, because the mean of its divisors is an integer number (39797618301).

Almost surely, 2^644810316670 is an apocalyptic number.

644810316670 is a deficient number, since it is larger than the sum of its proper divisors (628713468962).

644810316670 is a wasteful number, since it uses less digits than its factorization.

644810316670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93586476.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 644810316670 in words is "six hundred forty-four billion, eight hundred ten million, three hundred sixteen thousand, six hundred seventy".