66666165211156 has 24 divisors (see below), whose sum is σ = 141175408683456. Its totient is φ = 26890554034560.

The previous prime is 66666165211153. The next prime is 66666165211199. The reversal of 66666165211156 is 65111256166666.

It is a happy number.

It is a super-2 number, since 2×66666165211156² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66666165211156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666165211153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70027483990 + ... + 70027484941.

It is an arithmetic number, because the mean of its divisors is an integer number (5882308695144).

Almost surely, 2^{66666165211156} is an apocalyptic number.

It is an amenable number.

66666165211156 is an abundant number, since it is smaller than the sum of its proper divisors (74509243472300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66666165211156 is a wasteful number, since it uses less digits than its factorization.

66666165211156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140054968959 (or 140054968957 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 58.

The spelling of 66666165211156 in words is "sixty-six trillion, six hundred sixty-six billion, one hundred sixty-five million, two hundred eleven thousand, one hundred fifty-six".