66411660261 has 8 divisors (see below), whose sum is σ = 88555024800. Its totient is φ = 44271367952.

The previous prime is 66411660253. The next prime is 66411660377. The reversal of 66411660261 is 16206611466.

It is a happy number.

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 66411660261 - 2³ = 66411660253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66411660061) 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, 717135 + ... + 804428.

It is an arithmetic number, because the mean of its divisors is an integer number (11069378100).

Almost surely, 2^66411660261 is an apocalyptic number.

It is an amenable number.

66411660261 is a deficient number, since it is larger than the sum of its proper divisors (22143364539).

66411660261 is a wasteful number, since it uses less digits than its factorization.

66411660261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536115.

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 66411660261 in words is "sixty-six billion, four hundred eleven million, six hundred sixty thousand, two hundred sixty-one".