66268291 has 4 divisors (see below), whose sum is σ = 66367432. Its totient is φ = 66169152.

The previous prime is 66268271. The next prime is 66268309. The reversal of 66268291 is 19286266.

It is a happy number.

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 66268291 - 2²³ = 57879683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66268201) 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, 48561 + ... + 49906.

It is an arithmetic number, because the mean of its divisors is an integer number (16591858).

Almost surely, 2^66268291 is an apocalyptic number.

66268291 is a deficient number, since it is larger than the sum of its proper divisors (99141).

66268291 is an equidigital number, since it uses as much as digits as its factorization.

66268291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99140.

The product of its digits is 62208, while the sum is 40.

The square root of 66268291 is about 8140.5338277044. The cubic root of 66268291 is about 404.6708518099.

The spelling of 66268291 in words is "sixty-six million, two hundred sixty-eight thousand, two hundred ninety-one".