66648924 has 18 divisors (see below), whose sum is σ = 168473760. Its totient is φ = 22216296.

The previous prime is 66648919. The next prime is 66648947. The reversal of 66648924 is 42984666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 66648924.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925644 + ... + 925715.

Almost surely, 2^66648924 is an apocalyptic number.

It is an amenable number.

66648924 is an abundant number, since it is smaller than the sum of its proper divisors (101824836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66648924 is a wasteful number, since it uses less digits than its factorization.

66648924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851369 (or 1851364 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 66648924 is about 8163.8792249763. The cubic root of 66648924 is about 405.4441583524. Note that the first 3 decimals are identical.

The spelling of 66648924 in words is "sixty-six million, six hundred forty-eight thousand, nine hundred twenty-four".