66017740 has 12 divisors (see below), whose sum is σ = 138637296. Its totient is φ = 26407088.

The previous prime is 66017683. The next prime is 66017753. The reversal of 66017740 is 4771066.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1650424 + ... + 1650463.

It is an arithmetic number, because the mean of its divisors is an integer number (11553108).

Almost surely, 2^66017740 is an apocalyptic number.

It is an amenable number.

66017740 is an abundant number, since it is smaller than the sum of its proper divisors (72619556).

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

66017740 is a wasteful number, since it uses less digits than its factorization.

66017740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300896 (or 3300894 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66017740 is about 8125.1301528037. The cubic root of 66017740 is about 404.1602066964.

It can be divided in two parts, 6601 and 7740, that added together give a palindrome (14341).

The spelling of 66017740 in words is "sixty-six million, seventeen thousand, seven hundred forty".