66142990666 has 16 divisors (see below), whose sum is σ = 100420072704. Its totient is φ = 32669714464.

The previous prime is 66142990633. The next prime is 66142990673. The reversal of 66142990666 is 66609924166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2744766 + ... + 2768758.

It is an arithmetic number, because the mean of its divisors is an integer number (6276254544).

Almost surely, 2^66142990666 is an apocalyptic number.

66142990666 is a deficient number, since it is larger than the sum of its proper divisors (34277082038).

66142990666 is a wasteful number, since it uses less digits than its factorization.

66142990666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40685.

The product of its (nonzero) digits is 5038848, while the sum is 55.

The spelling of 66142990666 in words is "sixty-six billion, one hundred forty-two million, nine hundred ninety thousand, six hundred sixty-six".