644676953370 has 16 divisors (see below), whose sum is σ = 1547224688160. Its totient is φ = 171913854224.

The previous prime is 644676953369. The next prime is 644676953387. The reversal of 644676953370 is 73359676446.

It is a happy number.

644676953370 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10744615860 + ... + 10744615919.

It is an arithmetic number, because the mean of its divisors is an integer number (96701543010).

Almost surely, 2^644676953370 is an apocalyptic number.

644676953370 is an abundant number, since it is smaller than the sum of its proper divisors (902547734790).

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

644676953370 is a wasteful number, since it uses less digits than its factorization.

644676953370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21489231789.

The product of its (nonzero) digits is 68584320, while the sum is 60.

The spelling of 644676953370 in words is "six hundred forty-four billion, six hundred seventy-six million, nine hundred fifty-three thousand, three hundred seventy".