664662026 has 16 divisors (see below), whose sum is σ = 1139760960. Its totient is φ = 284770080.

The previous prime is 664662001. The next prime is 664662071. The reversal of 664662026 is 620266466.

664662026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71486 + ... + 80246.

It is an arithmetic number, because the mean of its divisors is an integer number (71235060).

Almost surely, 2^664662026 is an apocalyptic number.

664662026 is a deficient number, since it is larger than the sum of its proper divisors (475098934).

664662026 is a wasteful number, since it uses less digits than its factorization.

664662026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14189.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 664662026 is about 25781.0400488421. The cubic root of 664662026 is about 872.7039781655.

The spelling of 664662026 in words is "six hundred sixty-four million, six hundred sixty-two thousand, twenty-six".