66486571 has 2 divisors, whose sum is σ = 66486572. Its totient is φ = 66486570.

The previous prime is 66486551. The next prime is 66486587. The reversal of 66486571 is 17568466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66486571 - 2¹⁹ = 65962283 is a prime.

It is not a weakly prime, because it can be changed into another prime (66486551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33243285 + 33243286.

It is an arithmetic number, because the mean of its divisors is an integer number (33243286).

Almost surely, 2^66486571 is an apocalyptic number.

66486571 is a deficient number, since it is larger than the sum of its proper divisors (1).

66486571 is an equidigital number, since it uses as much as digits as its factorization.

66486571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 66486571 is about 8153.9297887583. The cubic root of 66486571 is about 405.1146776814.

The spelling of 66486571 in words is "sixty-six million, four hundred eighty-six thousand, five hundred seventy-one".