66644536 has 16 divisors (see below), whose sum is σ = 142809840. Its totient is φ = 28561920.

The previous prime is 66644521. The next prime is 66644549. The reversal of 66644536 is 63544666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594985 + ... + 595096.

It is an arithmetic number, because the mean of its divisors is an integer number (8925615).

Almost surely, 2^66644536 is an apocalyptic number.

It is an amenable number.

66644536 is an abundant number, since it is smaller than the sum of its proper divisors (76165304).

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

66644536 is a wasteful number, since it uses less digits than its factorization.

66644536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190094 (or 1190090 counting only the distinct ones).

The product of its digits is 311040, while the sum is 40.

The square root of 66644536 is about 8163.6104757638. The cubic root of 66644536 is about 405.4352603442.

The spelling of 66644536 in words is "sixty-six million, six hundred forty-four thousand, five hundred thirty-six".