66144244167 has 40 divisors (see below), whose sum is σ = 99508214256. Its totient is φ = 43784229888.

The previous prime is 66144244151. The next prime is 66144244193. The reversal of 66144244167 is 76144244166.

66144244167 is a `hidden beast` number, since 6 + 6 + 1 + 442 + 44 + 167 = 666.

It is not a de Polignac number, because 66144244167 - 2⁴ = 66144244151 is a prime.

It is a super-2 number, since 2×66144244167² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66144244367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21083623 + ... + 21086759.

Almost surely, 2^66144244167 is an apocalyptic number.

66144244167 is a deficient number, since it is larger than the sum of its proper divisors (33363970089).

66144244167 is a wasteful number, since it uses less digits than its factorization.

66144244167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909 (or 4900 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

Subtracting 66144244167 from its reverse (76144244166), we obtain a palindrome (9999999999).

The spelling of 66144244167 in words is "sixty-six billion, one hundred forty-four million, two hundred forty-four thousand, one hundred sixty-seven".