1443721663 has 2 divisors, whose sum is σ = 1443721664. Its totient is φ = 1443721662.

The previous prime is 1443721633. The next prime is 1443721667. The reversal of 1443721663 is 3661273441.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1443721663 - 2²¹ = 1441624511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1443721667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721860831 + 721860832.

It is an arithmetic number, because the mean of its divisors is an integer number (721860832).

Almost surely, 2^1443721663 is an apocalyptic number.

1443721663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1443721663 is an equidigital number, since it uses as much as digits as its factorization.

1443721663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 1443721663 is about 37996.3374945533. The cubic root of 1443721663 is about 1130.2152363648.

It can be divided in two parts, 14437 and 21663, that added together give a square (36100 = 190²).

The spelling of 1443721663 in words is "one billion, four hundred forty-three million, seven hundred twenty-one thousand, six hundred sixty-three".