1662642259 has 2 divisors, whose sum is σ = 1662642260. Its totient is φ = 1662642258.

The previous prime is 1662642227. The next prime is 1662642281. The reversal of 1662642259 is 9522462661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1662642259 - 2⁵ = 1662642227 is a prime.

It is not a weakly prime, because it can be changed into another prime (1662642299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831321129 + 831321130.

It is an arithmetic number, because the mean of its divisors is an integer number (831321130).

Almost surely, 2^1662642259 is an apocalyptic number.

1662642259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662642259 is an equidigital number, since it uses as much as digits as its factorization.

1662642259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 43.

The square root of 1662642259 is about 40775.5105302190. The cubic root of 1662642259 is about 1184.6760397932.

It can be divided in two parts, 16626 and 42259, that added together give a palindrome (58885).

The spelling of 1662642259 in words is "one billion, six hundred sixty-two million, six hundred forty-two thousand, two hundred fifty-nine".