66646026 has 24 divisors (see below), whose sum is σ = 145270944. Its totient is φ = 22081320.

The previous prime is 66646009. The next prime is 66646049. The reversal of 66646026 is 62064666.

66646026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8080 + ... + 14091.

It is an arithmetic number, because the mean of its divisors is an integer number (6052956).

Almost surely, 2^66646026 is an apocalyptic number.

66646026 is an abundant number, since it is smaller than the sum of its proper divisors (78624918).

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

66646026 is a wasteful number, since it uses less digits than its factorization.

66646026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22346 (or 22343 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 66646026 is about 8163.7017338950. The cubic root of 66646026 is about 405.4382818174.

The spelling of 66646026 in words is "sixty-six million, six hundred forty-six thousand, twenty-six".