66668532611 has 16 divisors (see below), whose sum is σ = 69912460800. Its totient is φ = 63516264000.

The previous prime is 66668532577. The next prime is 66668532653. The reversal of 66668532611 is 11623586666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66668532611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66668532611.

It is not an unprimeable number, because it can be changed into a prime (66668532311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274010 + ... + 456528.

It is an arithmetic number, because the mean of its divisors is an integer number (4369528800).

Almost surely, 2^66668532611 is an apocalyptic number.

66668532611 is a deficient number, since it is larger than the sum of its proper divisors (3243928189).

66668532611 is a wasteful number, since it uses less digits than its factorization.

66668532611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182770.

The product of its digits is 1866240, while the sum is 50.

The spelling of 66668532611 in words is "sixty-six billion, six hundred sixty-eight million, five hundred thirty-two thousand, six hundred eleven".