66640124 has 6 divisors (see below), whose sum is σ = 116620224. Its totient is φ = 33320060.

The previous prime is 66640117. The next prime is 66640139. The reversal of 66640124 is 42104666.

It is a super-2 number, since 2×66640124² = 8881812253470752, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 8330012 + ... + 8330019.

It is an arithmetic number, because the mean of its divisors is an integer number (19436704).

Almost surely, 2^66640124 is an apocalyptic number.

It is an amenable number.

66640124 is a deficient number, since it is larger than the sum of its proper divisors (49980100).

66640124 is a wasteful number, since it uses less digits than its factorization.

66640124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16660035 (or 16660033 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 66640124 is about 8163.3402477172. The cubic root of 66640124 is about 405.4263132749.

The spelling of 66640124 in words is "sixty-six million, six hundred forty thousand, one hundred twenty-four".