1663420139 has 2 divisors, whose sum is σ = 1663420140. Its totient is φ = 1663420138.

The previous prime is 1663420093. The next prime is 1663420153. The reversal of 1663420139 is 9310243661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1663420139 - 2²⁸ = 1394984683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1663420099 and 1663420108.

It is not a weakly prime, because it can be changed into another prime (1663420169) 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, 831710069 + 831710070.

It is an arithmetic number, because the mean of its divisors is an integer number (831710070).

Almost surely, 2^1663420139 is an apocalyptic number.

1663420139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663420139 is an equidigital number, since it uses as much as digits as its factorization.

1663420139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 1663420139 is about 40785.0479832990. The cubic root of 1663420139 is about 1184.8607642610.

The spelling of 1663420139 in words is "one billion, six hundred sixty-three million, four hundred twenty thousand, one hundred thirty-nine".