66186460121 has 2 divisors, whose sum is σ = 66186460122. Its totient is φ = 66186460120.

The previous prime is 66186460097. The next prime is 66186460133. The reversal of 66186460121 is 12106468166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57436915600 + 8749544521 = 239660^2 + 93539^2 .

It is a cyclic number.

It is not a de Polignac number, because 66186460121 - 2¹⁸ = 66186197977 is a prime.

It is not a weakly prime, because it can be changed into another prime (66186460181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33093230060 + 33093230061.

It is an arithmetic number, because the mean of its divisors is an integer number (33093230061).

Almost surely, 2^66186460121 is an apocalyptic number.

It is an amenable number.

66186460121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66186460121 is an equidigital number, since it uses as much as digits as its factorization.

66186460121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 66186460121 in words is "sixty-six billion, one hundred eighty-six million, four hundred sixty thousand, one hundred twenty-one".