66648747 has 8 divisors (see below), whose sum is σ = 96943680. Its totient is φ = 40393160.

The previous prime is 66648737. The next prime is 66648749. The reversal of 66648747 is 74784666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66648747 - 2⁴ = 66648731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66648696 and 66648705.

It is not an unprimeable number, because it can be changed into a prime (66648749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009797 + ... + 1009862.

It is an arithmetic number, because the mean of its divisors is an integer number (12117960).

Almost surely, 2^66648747 is an apocalyptic number.

66648747 is a deficient number, since it is larger than the sum of its proper divisors (30294933).

66648747 is a wasteful number, since it uses less digits than its factorization.

66648747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019673.

The product of its digits is 1354752, while the sum is 48.

The square root of 66648747 is about 8163.8683845344. The cubic root of 66648747 is about 405.4437994385.

The spelling of 66648747 in words is "sixty-six million, six hundred forty-eight thousand, seven hundred forty-seven".