66741075661 has 8 divisors (see below), whose sum is σ = 72021396384. Its totient is φ = 61481668080.

The previous prime is 66741075647. The next prime is 66741075733. The reversal of 66741075661 is 16657014766.

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 66741075661 - 2²⁹ = 66204204749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66741075601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5221651 + ... + 5234416.

It is an arithmetic number, because the mean of its divisors is an integer number (9002674548).

Almost surely, 2^66741075661 is an apocalyptic number.

It is an amenable number.

66741075661 is a deficient number, since it is larger than the sum of its proper divisors (5280320723).

66741075661 is a wasteful number, since it uses less digits than its factorization.

66741075661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10456571.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 66741075661 in words is "sixty-six billion, seven hundred forty-one million, seventy-five thousand, six hundred sixty-one".