66444626187 has 40 divisors (see below), whose sum is σ = 101553193632. Its totient is φ = 43281216000.

The previous prime is 66444626173. The next prime is 66444626189. The reversal of 66444626187 is 78162644466.

It is a happy number.

66444626187 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 4 + 626 + 1 + 8 + 7 = 666.

It is not a de Polignac number, because 66444626187 - 2⁸ = 66444625931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66444626189) 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, 701563 + ... + 790619.

Almost surely, 2^66444626187 is an apocalyptic number.

66444626187 is a deficient number, since it is larger than the sum of its proper divisors (35108567445).

66444626187 is a wasteful number, since it uses less digits than its factorization.

66444626187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89281 (or 89272 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 54.

The spelling of 66444626187 in words is "sixty-six billion, four hundred forty-four million, six hundred twenty-six thousand, one hundred eighty-seven".