66648915 has 24 divisors (see below), whose sum is σ = 119253888. Its totient is φ = 34398720.

The previous prime is 66648899. The next prime is 66648919. The reversal of 66648915 is 51984666.

It is not a de Polignac number, because 66648915 - 2⁴ = 66648899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66648919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22494 + ... + 25283.

It is an arithmetic number, because the mean of its divisors is an integer number (4968912).

Almost surely, 2^66648915 is an apocalyptic number.

66648915 is a deficient number, since it is larger than the sum of its proper divisors (52604973).

66648915 is a wasteful number, since it uses less digits than its factorization.

66648915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47819 (or 47816 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66648915 is about 8163.8786737678. The cubic root of 66648915 is about 405.4441401026. Note that the first 3 decimals are identical.

The spelling of 66648915 in words is "sixty-six million, six hundred forty-eight thousand, nine hundred fifteen".