661952566 has 8 divisors (see below), whose sum is σ = 1083195144. Its totient is φ = 300887520.

The previous prime is 661952549. The next prime is 661952567. The reversal of 661952566 is 665259166.

It is a happy number.

661952566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661952567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15044355 + ... + 15044398.

It is an arithmetic number, because the mean of its divisors is an integer number (135399393).

Almost surely, 2^661952566 is an apocalyptic number.

661952566 is a deficient number, since it is larger than the sum of its proper divisors (421242578).

661952566 is a wasteful number, since it uses less digits than its factorization.

661952566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30088766.

The product of its digits is 583200, while the sum is 46.

The square root of 661952566 is about 25728.4388566427. The cubic root of 661952566 is about 871.5165191154.

The spelling of 661952566 in words is "six hundred sixty-one million, nine hundred fifty-two thousand, five hundred sixty-six".