66169053659 has 4 divisors (see below), whose sum is σ = 66279152520. Its totient is φ = 66058954800.

The previous prime is 66169053647. The next prime is 66169053677. The reversal of 66169053659 is 95635096166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66169053659 - 2²⁰ = 66168005083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66169053619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55048529 + ... + 55049730.

It is an arithmetic number, because the mean of its divisors is an integer number (16569788130).

Almost surely, 2^66169053659 is an apocalyptic number.

66169053659 is a deficient number, since it is larger than the sum of its proper divisors (110098861).

66169053659 is a wasteful number, since it uses less digits than its factorization.

66169053659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110098860.

The product of its (nonzero) digits is 7873200, while the sum is 56.

The spelling of 66169053659 in words is "sixty-six billion, one hundred sixty-nine million, fifty-three thousand, six hundred fifty-nine".