1644065063 has 2 divisors, whose sum is σ = 1644065064. Its totient is φ = 1644065062.

The previous prime is 1644065051. The next prime is 1644065119. The reversal of 1644065063 is 3605604461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1644065063 - 2⁶ = 1644064999 is a prime.

It is a super-3 number, since 3×1644065063³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644065263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822032531 + 822032532.

It is an arithmetic number, because the mean of its divisors is an integer number (822032532).

Almost surely, 2^1644065063 is an apocalyptic number.

1644065063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644065063 is an equidigital number, since it uses as much as digits as its factorization.

1644065063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1644065063 is about 40547.0721877671. The cubic root of 1644065063 is about 1180.2472581062.

The spelling of 1644065063 in words is "one billion, six hundred forty-four million, sixty-five thousand, sixty-three".