644960420174 has 16 divisors (see below), whose sum is σ = 1105782010368. Its totient is φ = 276377714712.

The previous prime is 644960420171. The next prime is 644960420189. The reversal of 644960420174 is 471024069446.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644960420171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2706074 + ... + 2934749.

It is an arithmetic number, because the mean of its divisors is an integer number (69111375648).

Almost surely, 2^644960420174 is an apocalyptic number.

644960420174 is a deficient number, since it is larger than the sum of its proper divisors (460821590194).

644960420174 is a wasteful number, since it uses less digits than its factorization.

644960420174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648999.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 644960420174 in words is "six hundred forty-four billion, nine hundred sixty million, four hundred twenty thousand, one hundred seventy-four".