644474517703 has 2 divisors, whose sum is σ = 644474517704. Its totient is φ = 644474517702.

The previous prime is 644474517671. The next prime is 644474517781. The reversal of 644474517703 is 307715474446.

644474517703 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644474517703 - 2⁵ = 644474517671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644474527703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322237258851 + 322237258852.

It is an arithmetic number, because the mean of its divisors is an integer number (322237258852).

Almost surely, 2^644474517703 is an apocalyptic number.

644474517703 is a deficient number, since it is larger than the sum of its proper divisors (1).

644474517703 is an equidigital number, since it uses as much as digits as its factorization.

644474517703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7902720, while the sum is 52.

The spelling of 644474517703 in words is "six hundred forty-four billion, four hundred seventy-four million, five hundred seventeen thousand, seven hundred three".