66140140 has 48 divisors (see below), whose sum is σ = 159505920. Its totient is φ = 22783680.

The previous prime is 66140119. The next prime is 66140141. The reversal of 66140140 is 4104166.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (66140141) 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 15 ways as a sum of consecutive naturals, for example, 3732 + ... + 12091.

It is an arithmetic number, because the mean of its divisors is an integer number (3323040).

Almost surely, 2^66140140 is an apocalyptic number.

It is an amenable number.

66140140 is an abundant number, since it is smaller than the sum of its proper divisors (93365780).

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

66140140 is a wasteful number, since it uses less digits than its factorization.

66140140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15862 (or 15860 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 66140140 is about 8132.6588518147. The cubic root of 66140140 is about 404.4098298431.

The spelling of 66140140 in words is "sixty-six million, one hundred forty thousand, one hundred forty".