66187727 has 2 divisors, whose sum is σ = 66187728. Its totient is φ = 66187726.

The previous prime is 66187711. The next prime is 66187729. The reversal of 66187727 is 72778166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66187727 - 2⁴ = 66187711 is a prime.

Together with 66187729, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66187729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33093863 + 33093864.

It is an arithmetic number, because the mean of its divisors is an integer number (33093864).

Almost surely, 2^66187727 is an apocalyptic number.

66187727 is a deficient number, since it is larger than the sum of its proper divisors (1).

66187727 is an equidigital number, since it uses as much as digits as its factorization.

66187727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 44.

The square root of 66187727 is about 8135.5839987059. The cubic root of 66187727 is about 404.5067958560.

It can be divided in two parts, 661 and 87727, that added together give a palindrome (88388).

The spelling of 66187727 in words is "sixty-six million, one hundred eighty-seven thousand, seven hundred twenty-seven".