66006247 has 16 divisors (see below), whose sum is σ = 71660160. Its totient is φ = 60594912.

The previous prime is 66006221. The next prime is 66006263. The reversal of 66006247 is 74260066.

It is a de Polignac number, because none of the positive numbers 2^k-66006247 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 (66006277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141108 + ... + 141574.

It is an arithmetic number, because the mean of its divisors is an integer number (4478760).

Almost surely, 2^66006247 is an apocalyptic number.

66006247 is a deficient number, since it is larger than the sum of its proper divisors (5653913).

66006247 is a wasteful number, since it uses less digits than its factorization.

66006247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 66006247 is about 8124.4228718106. The cubic root of 66006247 is about 404.1367519763.

The spelling of 66006247 in words is "sixty-six million, six thousand, two hundred forty-seven".