66497291 has 4 divisors (see below), whose sum is σ = 75996912. Its totient is φ = 56997672.

The previous prime is 66497279. The next prime is 66497293. The reversal of 66497291 is 19279466.

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 66497291 - 2¹⁰ = 66496267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66497293) 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, 4749800 + ... + 4749813.

It is an arithmetic number, because the mean of its divisors is an integer number (18999228).

Almost surely, 2^66497291 is an apocalyptic number.

66497291 is a deficient number, since it is larger than the sum of its proper divisors (9499621).

66497291 is an equidigital number, since it uses as much as digits as its factorization.

66497291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9499620.

The product of its digits is 163296, while the sum is 44.

The square root of 66497291 is about 8154.5871140114. The cubic root of 66497291 is about 405.1364494763.

The spelling of 66497291 in words is "sixty-six million, four hundred ninety-seven thousand, two hundred ninety-one".