66617022765 has 16 divisors (see below), whose sum is σ = 106732666368. Its totient is φ = 35480602176.

The previous prime is 66617022751. The next prime is 66617022781. The reversal of 66617022765 is 56722071666.

It is not a de Polignac number, because 66617022765 - 2⁹ = 66617022253 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3018429 + ... + 3040418.

It is an arithmetic number, because the mean of its divisors is an integer number (6670791648).

Almost surely, 2^66617022765 is an apocalyptic number.

It is an amenable number.

66617022765 is a deficient number, since it is larger than the sum of its proper divisors (40115643603).

66617022765 is a wasteful number, since it uses less digits than its factorization.

66617022765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059588.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 66617022765 in words is "sixty-six billion, six hundred seventeen million, twenty-two thousand, seven hundred sixty-five".