66140661 has 8 divisors (see below), whose sum is σ = 89851680. Its totient is φ = 43261712.

The previous prime is 66140647. The next prime is 66140687. The reversal of 66140661 is 16604166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66140661 - 2⁷ = 66140533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66140611) 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 7 ways as a sum of consecutive naturals, for example, 207831 + ... + 208148.

It is an arithmetic number, because the mean of its divisors is an integer number (11231460).

Almost surely, 2^66140661 is an apocalyptic number.

It is an amenable number.

66140661 is a deficient number, since it is larger than the sum of its proper divisors (23711019).

66140661 is a wasteful number, since it uses less digits than its factorization.

66140661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416035.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66140661 is about 8132.6908830964. The cubic root of 66140661 is about 404.4108917145.

The spelling of 66140661 in words is "sixty-six million, one hundred forty thousand, six hundred sixty-one".