66249211 has 4 divisors (see below), whose sum is σ = 75713392. Its totient is φ = 56785032.

The previous prime is 66249199. The next prime is 66249229. The reversal of 66249211 is 11294266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66249211 - 2⁷ = 66249083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66249241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4732080 + ... + 4732093.

It is an arithmetic number, because the mean of its divisors is an integer number (18928348).

Almost surely, 2^66249211 is an apocalyptic number.

66249211 is a deficient number, since it is larger than the sum of its proper divisors (9464181).

66249211 is an equidigital number, since it uses as much as digits as its factorization.

66249211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9464180.

The product of its digits is 5184, while the sum is 31.

The square root of 66249211 is about 8139.3618300208. The cubic root of 66249211 is about 404.6320104028.

The spelling of 66249211 in words is "sixty-six million, two hundred forty-nine thousand, two hundred eleven".