644732047093 has 2 divisors, whose sum is σ = 644732047094. Its totient is φ = 644732047092.

The previous prime is 644732047073. The next prime is 644732047097. The reversal of 644732047093 is 390740237446.

644732047093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 557318985444 + 87413061649 = 746538^2 + 295657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644732047093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644732047097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322366023546 + 322366023547.

It is an arithmetic number, because the mean of its divisors is an integer number (322366023547).

Almost surely, 2^644732047093 is an apocalyptic number.

It is an amenable number.

644732047093 is a deficient number, since it is larger than the sum of its proper divisors (1).

644732047093 is an equidigital number, since it uses as much as digits as its factorization.

644732047093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 49.

The spelling of 644732047093 in words is "six hundred forty-four billion, seven hundred thirty-two million, forty-seven thousand, ninety-three".