66137216989271 has 4 divisors (see below), whose sum is σ = 66502615978344. Its totient is φ = 65771818000200.

The previous prime is 66137216989163. The next prime is 66137216989279. The reversal of 66137216989271 is 17298961273166.

66137216989271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66137216989271 is a prime.

It is a super-2 number, since 2×66137216989271² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66137216989279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182699494265 + ... + 182699494626.

It is an arithmetic number, because the mean of its divisors is an integer number (16625653994586).

Almost surely, 2^{66137216989271} is an apocalyptic number.

66137216989271 is a deficient number, since it is larger than the sum of its proper divisors (365398989073).

66137216989271 is a wasteful number, since it uses less digits than its factorization.

66137216989271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365398989072.

The product of its digits is 82301184, while the sum is 68.

The spelling of 66137216989271 in words is "sixty-six trillion, one hundred thirty-seven billion, two hundred sixteen million, nine hundred eighty-nine thousand, two hundred seventy-one".