66001666142651 has 8 divisors (see below), whose sum is σ = 66365470323120. Its totient is φ = 65638519243488.

The previous prime is 66001666142603. The next prime is 66001666142681. The reversal of 66001666142651 is 15624166610066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66001666142651 - 2²² = 66001661948347 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 66001666142651.

It is not an unprimeable number, because it can be changed into a prime (66001666142681) 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, 164118941 + ... + 164520606.

It is an arithmetic number, because the mean of its divisors is an integer number (8295683790390).

Almost surely, 2^{66001666142651} is an apocalyptic number.

66001666142651 is a deficient number, since it is larger than the sum of its proper divisors (363804180469).

66001666142651 is a wasteful number, since it uses less digits than its factorization.

66001666142651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328640653.

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

The spelling of 66001666142651 in words is "sixty-six trillion, one billion, six hundred sixty-six million, one hundred forty-two thousand, six hundred fifty-one".