66142375563251 has 16 divisors (see below), whose sum is σ = 71611375416000. Its totient is φ = 60728020835328.

The previous prime is 66142375563221. The next prime is 66142375563331. The reversal of 66142375563251 is 15236557324166.

It is a cyclic number.

It is not a de Polignac number, because 66142375563251 - 2¹⁰ = 66142375562227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66142375563211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3852815 + ... + 12129671.

It is an arithmetic number, because the mean of its divisors is an integer number (4475710963500).

Almost surely, 2^{66142375563251} is an apocalyptic number.

66142375563251 is a deficient number, since it is larger than the sum of its proper divisors (5468999852749).

66142375563251 is a wasteful number, since it uses less digits than its factorization.

66142375563251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8280158.

The product of its digits is 27216000, while the sum is 56.

The spelling of 66142375563251 in words is "sixty-six trillion, one hundred forty-two billion, three hundred seventy-five million, five hundred sixty-three thousand, two hundred fifty-one".