66008747 has 4 divisors (see below), whose sum is σ = 75438576. Its totient is φ = 56578920.

The previous prime is 66008743. The next prime is 66008749. The reversal of 66008747 is 74780066.

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 66008747 - 2² = 66008743 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 66008747.

It is not an unprimeable number, because it can be changed into a prime (66008743) 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, 4714904 + ... + 4714917.

It is an arithmetic number, because the mean of its divisors is an integer number (18859644).

Almost surely, 2^66008747 is an apocalyptic number.

66008747 is a deficient number, since it is larger than the sum of its proper divisors (9429829).

66008747 is an equidigital number, since it uses as much as digits as its factorization.

66008747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429828.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 66008747 is about 8124.5767274363. The cubic root of 66008747 is about 404.1418541657.

The spelling of 66008747 in words is "sixty-six million, eight thousand, seven hundred forty-seven".