6666344590 has 16 divisors (see below), whose sum is σ = 12003301872. Its totient is φ = 2665675264.

The previous prime is 6666344561. The next prime is 6666344599. The reversal of 6666344590 is 954436666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666344599) 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, 74884 + ... + 137623.

It is an arithmetic number, because the mean of its divisors is an integer number (750206367).

Almost surely, 2^6666344590 is an apocalyptic number.

6666344590 is a deficient number, since it is larger than the sum of its proper divisors (5336957282).

6666344590 is a wasteful number, since it uses less digits than its factorization.

6666344590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215651.

The product of its (nonzero) digits is 2799360, while the sum is 49.

The square root of 6666344590 is about 81647.6857602223. The cubic root of 6666344590 is about 1882.0417486992.

The spelling of 6666344590 in words is "six billion, six hundred sixty-six million, three hundred forty-four thousand, five hundred ninety".