66176662889 has 2 divisors, whose sum is σ = 66176662890. Its totient is φ = 66176662888.

The previous prime is 66176662861. The next prime is 66176662931. The reversal of 66176662889 is 98826667166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47924652889 + 18252010000 = 218917^2 + 135100^2 .

It is a cyclic number.

It is not a de Polignac number, because 66176662889 - 2¹⁶ = 66176597353 is a prime.

It is a super-2 number, since 2×66176662889² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66176662289) 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 as a sum of consecutive naturals, namely, 33088331444 + 33088331445.

It is an arithmetic number, because the mean of its divisors is an integer number (33088331445).

Almost surely, 2^66176662889 is an apocalyptic number.

It is an amenable number.

66176662889 is a deficient number, since it is larger than the sum of its proper divisors (1).

66176662889 is an equidigital number, since it uses as much as digits as its factorization.

66176662889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 65.

The spelling of 66176662889 in words is "sixty-six billion, one hundred seventy-six million, six hundred sixty-two thousand, eight hundred eighty-nine".