66111800027 has 12 divisors (see below), whose sum is σ = 81815449680. Its totient is φ = 52308236448.

The previous prime is 66111799991. The next prime is 66111800039. The reversal of 66111800027 is 72000811166.

It is a happy number.

It is not a de Polignac number, because 66111800027 - 2²² = 66107605723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66111799966 and 66111800002.

It is not an unprimeable number, because it can be changed into a prime (66111800057) 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 11 ways as a sum of consecutive naturals, for example, 27941252 + ... + 27943617.

It is an arithmetic number, because the mean of its divisors is an integer number (6817954140).

Almost surely, 2^66111800027 is an apocalyptic number.

66111800027 is a deficient number, since it is larger than the sum of its proper divisors (15703649653).

66111800027 is a wasteful number, since it uses less digits than its factorization.

66111800027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55884902 (or 55884889 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 66111800027 in words is "sixty-six billion, one hundred eleven million, eight hundred thousand, twenty-seven".