66707247 has 4 divisors (see below), whose sum is σ = 88943000. Its totient is φ = 44471496.

The previous prime is 66707227. The next prime is 66707281. The reversal of 66707247 is 74270766.

It is a happy number.

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

It is not a de Polignac number, because 66707247 - 2¹⁰ = 66706223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707227) 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, 11117872 + ... + 11117877.

It is an arithmetic number, because the mean of its divisors is an integer number (22235750).

Almost surely, 2^66707247 is an apocalyptic number.

66707247 is a deficient number, since it is larger than the sum of its proper divisors (22235753).

66707247 is a wasteful number, since it uses less digits than its factorization.

66707247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22235752.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 66707247 is about 8167.4504589866. The cubic root of 66707247 is about 405.5623889454.

The spelling of 66707247 in words is "sixty-six million, seven hundred seven thousand, two hundred forty-seven".