1663221499 has 2 divisors, whose sum is σ = 1663221500. Its totient is φ = 1663221498.

The previous prime is 1663221463. The next prime is 1663221529. The reversal of 1663221499 is 9941223661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1663221499 - 2⁹ = 1663220987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663221799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831610749 + 831610750.

It is an arithmetic number, because the mean of its divisors is an integer number (831610750).

Almost surely, 2^1663221499 is an apocalyptic number.

1663221499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663221499 is an equidigital number, since it uses as much as digits as its factorization.

1663221499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 1663221499 is about 40782.6127044357. The cubic root of 1663221499 is about 1184.8135983635.

The spelling of 1663221499 in words is "one billion, six hundred sixty-three million, two hundred twenty-one thousand, four hundred ninety-nine".