666611640734 has 64 divisors (see below), whose sum is σ = 1122583418880. Its totient is φ = 294796402560.

The previous prime is 666611640689. The next prime is 666611640757. The reversal of 666611640734 is 437046116666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237819377 + ... + 237822179.

It is an arithmetic number, because the mean of its divisors is an integer number (17540365920).

Almost surely, 2^666611640734 is an apocalyptic number.

666611640734 is a deficient number, since it is larger than the sum of its proper divisors (455971778146).

666611640734 is a wasteful number, since it uses less digits than its factorization.

666611640734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5665.

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 666611640734 in words is "six hundred sixty-six billion, six hundred eleven million, six hundred forty thousand, seven hundred thirty-four".