66660565161 has 8 divisors (see below), whose sum is σ = 88899890400. Its totient is φ = 44430808352.

The previous prime is 66660565157. The next prime is 66660565199. The reversal of 66660565161 is 16156506666.

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 66660565161 - 2² = 66660565157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66660565161.

It is not an unprimeable number, because it can be changed into a prime (66660565151) 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, 2375835 + ... + 2403728.

It is an arithmetic number, because the mean of its divisors is an integer number (11112486300).

Almost surely, 2^66660565161 is an apocalyptic number.

It is an amenable number.

66660565161 is a deficient number, since it is larger than the sum of its proper divisors (22239325239).

66660565161 is a wasteful number, since it uses less digits than its factorization.

66660565161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784215.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 66660565161 in words is "sixty-six billion, six hundred sixty million, five hundred sixty-five thousand, one hundred sixty-one".