1720322663 has 2 divisors, whose sum is σ = 1720322664. Its totient is φ = 1720322662.

The previous prime is 1720322641. The next prime is 1720322689. The reversal of 1720322663 is 3662230271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720322663 - 2²⁰ = 1719274087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720322603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860161331 + 860161332.

It is an arithmetic number, because the mean of its divisors is an integer number (860161332).

Almost surely, 2^1720322663 is an apocalyptic number.

1720322663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720322663 is an equidigital number, since it uses as much as digits as its factorization.

1720322663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 1720322663 is about 41476.7725721276. The cubic root of 1720322663 is about 1198.2202002231.

The spelling of 1720322663 in words is "one billion, seven hundred twenty million, three hundred twenty-two thousand, six hundred sixty-three".