659997566 has 16 divisors (see below), whose sum is σ = 1043145600. Its totient is φ = 312317208.

The previous prime is 659997563. The next prime is 659997577. The reversal of 659997566 is 665799956.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 659997499 and 659997508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659997563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32225 + ... + 48563.

It is an arithmetic number, because the mean of its divisors is an integer number (65196600).

Almost surely, 2^659997566 is an apocalyptic number.

659997566 is a deficient number, since it is larger than the sum of its proper divisors (383148034).

659997566 is a wasteful number, since it uses less digits than its factorization.

659997566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17423.

The product of its digits is 27556200, while the sum is 62.

The square root of 659997566 is about 25690.4177856258. The cubic root of 659997566 is about 870.6576988214.

The spelling of 659997566 in words is "six hundred fifty-nine million, nine hundred ninety-seven thousand, five hundred sixty-six".