66898571 has 2 divisors, whose sum is σ = 66898572. Its totient is φ = 66898570.

The previous prime is 66898567. The next prime is 66898591. The reversal of 66898571 is 17589866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66898571 - 2² = 66898567 is a prime.

It is not a weakly prime, because it can be changed into another prime (66898591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33449285 + 33449286.

It is an arithmetic number, because the mean of its divisors is an integer number (33449286).

Almost surely, 2^66898571 is an apocalyptic number.

66898571 is a deficient number, since it is larger than the sum of its proper divisors (1).

66898571 is an equidigital number, since it uses as much as digits as its factorization.

66898571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 66898571 is about 8179.1546629221. The cubic root of 66898571 is about 405.9497519248.

The spelling of 66898571 in words is "sixty-six million, eight hundred ninety-eight thousand, five hundred seventy-one".