66214261 has 4 divisors (see below), whose sum is σ = 66550572. Its totient is φ = 65877952.

The previous prime is 66214241. The next prime is 66214277. The reversal of 66214261 is 16241266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42497361 + 23716900 = 6519^2 + 4870^2 .

It is a cyclic number.

It is not a de Polignac number, because 66214261 - 2¹¹ = 66212213 is a prime.

It is a super-2 number, since 2×66214261² = 8768656719552242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66214241) 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, 167860 + ... + 168253.

It is an arithmetic number, because the mean of its divisors is an integer number (16637643).

Almost surely, 2^66214261 is an apocalyptic number.

It is an amenable number.

66214261 is a deficient number, since it is larger than the sum of its proper divisors (336311).

66214261 is a wasteful number, since it uses less digits than its factorization.

66214261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336310.

The product of its digits is 3456, while the sum is 28.

The square root of 66214261 is about 8137.2145725672. The cubic root of 66214261 is about 404.5608428818.

The spelling of 66214261 in words is "sixty-six million, two hundred fourteen thousand, two hundred sixty-one".