259668666 has 40 divisors (see below), whose sum is σ = 607156704. Its totient is φ = 82791720.

The previous prime is 259668641. The next prime is 259668667. The reversal of 259668666 is 666866952.

It is a super-2 number, since 2×259668666² = 134855632204439112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (259668667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31120 + ... + 38571.

Almost surely, 2^259668666 is an apocalyptic number.

259668666 is an abundant number, since it is smaller than the sum of its proper divisors (347488038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

259668666 is a wasteful number, since it uses less digits than its factorization.

259668666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69728 (or 69719 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 259668666 is about 16114.2379900509. The cubic root of 259668666 is about 637.9791940359.

The spelling of 259668666 in words is "two hundred fifty-nine million, six hundred sixty-eight thousand, six hundred sixty-six".