66664548 has 36 divisors (see below), whose sum is σ = 178427340. Its totient is φ = 20914176.

The previous prime is 66664547. The next prime is 66664561. The reversal of 66664548 is 84546666.

It can be written as a sum of positive squares in 2 ways, for example, as 38340864 + 28323684 = 6192^2 + 5322^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (66664547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53853 + ... + 55076.

It is an arithmetic number, because the mean of its divisors is an integer number (4956315).

Almost surely, 2^66664548 is an apocalyptic number.

66664548 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66664548 is an abundant number, since it is smaller than the sum of its proper divisors (111762792).

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

66664548 is a wasteful number, since it uses less digits than its factorization.

66664548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108956 (or 108951 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 66664548 is about 8164.8360669397. The cubic root of 66664548 is about 405.4758376065.

The spelling of 66664548 in words is "sixty-six million, six hundred sixty-four thousand, five hundred forty-eight".