66644410 has 48 divisors (see below), whose sum is σ = 142835616. Its totient is φ = 22311072.

The previous prime is 66644387. The next prime is 66644411. The reversal of 66644410 is 1444666.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66644411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19489 + ... + 22651.

It is an arithmetic number, because the mean of its divisors is an integer number (2975742).

Almost surely, 2^66644410 is an apocalyptic number.

66644410 is an abundant number, since it is smaller than the sum of its proper divisors (76191206).

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

66644410 is a wasteful number, since it uses less digits than its factorization.

66644410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227 (or 3220 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 66644410 is about 8163.6027585864. The cubic root of 66644410 is about 405.4350048350.

The spelling of 66644410 in words is "sixty-six million, six hundred forty-four thousand, four hundred ten".