66711266 has 4 divisors (see below), whose sum is σ = 100066902. Its totient is φ = 33355632.

The previous prime is 66711263. The next prime is 66711277. The reversal of 66711266 is 66211766.

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

It can be written as a sum of positive squares in only one way, i.e., 36954241 + 29757025 = 6079^2 + 5455^2 .

It is a super-2 number, since 2×66711266² = 8900786022645512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66711263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16677815 + ... + 16677818.

Almost surely, 2^66711266 is an apocalyptic number.

66711266 is a deficient number, since it is larger than the sum of its proper divisors (33355636).

66711266 is a wasteful number, since it uses less digits than its factorization.

66711266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33355635.

The product of its digits is 18144, while the sum is 35.

The square root of 66711266 is about 8167.6964928920. The cubic root of 66711266 is about 405.5705336003.

Subtracting from 66711266 its reverse (66211766), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 66711266 in words is "sixty-six million, seven hundred eleven thousand, two hundred sixty-six".