66111665073 has 4 divisors (see below), whose sum is σ = 88148886768. Its totient is φ = 44074443380.

The previous prime is 66111665063. The next prime is 66111665077. The reversal of 66111665073 is 37056611166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66111665073 - 2⁴ = 66111665057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66111665077) 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, 11018610843 + ... + 11018610848.

It is an arithmetic number, because the mean of its divisors is an integer number (22037221692).

Almost surely, 2^66111665073 is an apocalyptic number.

It is an amenable number.

66111665073 is a deficient number, since it is larger than the sum of its proper divisors (22037221695).

66111665073 is a wasteful number, since it uses less digits than its factorization.

66111665073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22037221694.

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 66111665073 in words is "sixty-six billion, one hundred eleven million, six hundred sixty-five thousand, seventy-three".