259816642 has 16 divisors (see below), whose sum is σ = 406289664. Its totient is φ = 124470000.

The previous prime is 259816639. The next prime is 259816663. The reversal of 259816642 is 246618952.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 14484 + ... + 27007.

It is an arithmetic number, because the mean of its divisors is an integer number (25393104).

Almost surely, 2^259816642 is an apocalyptic number.

259816642 is a deficient number, since it is larger than the sum of its proper divisors (146473022).

259816642 is a wasteful number, since it uses less digits than its factorization.

259816642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41625.

The product of its digits is 207360, while the sum is 43.

The square root of 259816642 is about 16118.8288036073. The cubic root of 259816642 is about 638.1003582918.

It can be divided in two parts, 25981 and 6642, that added together give a palindrome (32623).

The spelling of 259816642 in words is "two hundred fifty-nine million, eight hundred sixteen thousand, six hundred forty-two".