66454247 has 4 divisors (see below), whose sum is σ = 67295520. Its totient is φ = 65612976.

The previous prime is 66454231. The next prime is 66454249. The reversal of 66454247 is 74245466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74245466 = 2 ⋅37122733.

It is not a de Polignac number, because 66454247 - 2⁴ = 66454231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66454247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66454249) 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, 420518 + ... + 420675.

It is an arithmetic number, because the mean of its divisors is an integer number (16823880).

Almost surely, 2^66454247 is an apocalyptic number.

66454247 is a deficient number, since it is larger than the sum of its proper divisors (841273).

66454247 is an equidigital number, since it uses as much as digits as its factorization.

66454247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841272.

The product of its digits is 161280, while the sum is 38.

The square root of 66454247 is about 8151.9474360425. The cubic root of 66454247 is about 405.0490150503.

The spelling of 66454247 in words is "sixty-six million, four hundred fifty-four thousand, two hundred forty-seven".