66172411 has 2 divisors, whose sum is σ = 66172412. Its totient is φ = 66172410.

The previous prime is 66172397. The next prime is 66172417. The reversal of 66172411 is 11427166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66172411 - 2⁷ = 66172283 is a prime.

It is equal to p_3905740 and since 66172411 and 3905740 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66172411.

It is not a weakly prime, because it can be changed into another prime (66172417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33086205 + 33086206.

It is an arithmetic number, because the mean of its divisors is an integer number (33086206).

Almost surely, 2^66172411 is an apocalyptic number.

66172411 is a deficient number, since it is larger than the sum of its proper divisors (1).

66172411 is an equidigital number, since it uses as much as digits as its factorization.

66172411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 66172411 is about 8134.6426473447. The cubic root of 66172411 is about 404.4755921656.

Adding to 66172411 its reverse (11427166), we get a palindrome (77599577).

The spelling of 66172411 in words is "sixty-six million, one hundred seventy-two thousand, four hundred eleven".