66623144665 has 16 divisors (see below), whose sum is σ = 99675146880. Its totient is φ = 41531310720.

The previous prime is 66623144629. The next prime is 66623144683. The reversal of 66623144665 is 56644132666.

It is not a de Polignac number, because 66623144665 - 2⁷ = 66623144537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86523180 + ... + 86523949.

It is an arithmetic number, because the mean of its divisors is an integer number (6229696680).

Almost surely, 2^66623144665 is an apocalyptic number.

It is an amenable number.

66623144665 is a deficient number, since it is larger than the sum of its proper divisors (33052002215).

66623144665 is a wasteful number, since it uses less digits than its factorization.

66623144665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173047152.

The product of its digits is 3732480, while the sum is 49.

The spelling of 66623144665 in words is "sixty-six billion, six hundred twenty-three million, one hundred forty-four thousand, six hundred sixty-five".