66061266671 has 16 divisors (see below), whose sum is σ = 70216445376. Its totient is φ = 61936283136.

The previous prime is 66061266641. The next prime is 66061266721. The reversal of 66061266671 is 17666216066.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66061266671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66061266641) 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, 9950165 + ... + 9956801.

It is an arithmetic number, because the mean of its divisors is an integer number (4388527836).

Almost surely, 2^66061266671 is an apocalyptic number.

66061266671 is a deficient number, since it is larger than the sum of its proper divisors (4155178705).

66061266671 is a wasteful number, since it uses less digits than its factorization.

66061266671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8818.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 66061266671 in words is "sixty-six billion, sixty-one million, two hundred sixty-six thousand, six hundred seventy-one".