666530659590 has 16 divisors (see below), whose sum is σ = 1599673583088. Its totient is φ = 177741509216.

The previous prime is 666530659579. The next prime is 666530659591. The reversal of 666530659590 is 95956035666.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666530659591) 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, 11108844297 + ... + 11108844356.

It is an arithmetic number, because the mean of its divisors is an integer number (99979598943).

Almost surely, 2^666530659590 is an apocalyptic number.

666530659590 is an abundant number, since it is smaller than the sum of its proper divisors (933142923498).

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

666530659590 is a wasteful number, since it uses less digits than its factorization.

666530659590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22217688663.

The product of its (nonzero) digits is 39366000, while the sum is 60.

The spelling of 666530659590 in words is "six hundred sixty-six billion, five hundred thirty million, six hundred fifty-nine thousand, five hundred ninety".