1663208431 has 2 divisors, whose sum is σ = 1663208432. Its totient is φ = 1663208430.

The previous prime is 1663208399. The next prime is 1663208461. The reversal of 1663208431 is 1348023661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1663208431 - 2⁵ = 1663208399 is a prime.

It is a super-2 number, since 2×1663208431² = 5532524569898963522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663208461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831604215 + 831604216.

It is an arithmetic number, because the mean of its divisors is an integer number (831604216).

Almost surely, 2^1663208431 is an apocalyptic number.

1663208431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663208431 is an equidigital number, since it uses as much as digits as its factorization.

1663208431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1663208431 is about 40782.4524887849. The cubic root of 1663208431 is about 1184.8104953123.

The spelling of 1663208431 in words is "one billion, six hundred sixty-three million, two hundred eight thousand, four hundred thirty-one".