259661378 has 4 divisors (see below), whose sum is σ = 389492070. Its totient is φ = 129830688.

The previous prime is 259661371. The next prime is 259661393. The reversal of 259661378 is 873166952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 241709209 + 17952169 = 15547^2 + 4237^2 .

It is not an unprimeable number, because it can be changed into a prime (259661371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64915343 + ... + 64915346.

Almost surely, 2^259661378 is an apocalyptic number.

259661378 is a deficient number, since it is larger than the sum of its proper divisors (129830692).

259661378 is a wasteful number, since it uses less digits than its factorization.

259661378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129830691.

The product of its digits is 544320, while the sum is 47.

The square root of 259661378 is about 16114.0118530427. The cubic root of 259661378 is about 637.9732253580.

The spelling of 259661378 in words is "two hundred fifty-nine million, six hundred sixty-one thousand, three hundred seventy-eight".