66288128785 has 16 divisors (see below), whose sum is σ = 82119808512. Its totient is φ = 51314803200.

The previous prime is 66288128779. The next prime is 66288128791. The reversal of 66288128785 is 58782188266.

66288128785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66288128779) and next prime (66288128791).

It is not a de Polignac number, because 66288128785 - 2⁹ = 66288128273 is a prime.

It is a Duffinian number.

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, 2681130 + ... + 2705740.

It is an arithmetic number, because the mean of its divisors is an integer number (5132488032).

Almost surely, 2^66288128785 is an apocalyptic number.

It is an amenable number.

66288128785 is a deficient number, since it is larger than the sum of its proper divisors (15831679727).

66288128785 is a wasteful number, since it uses less digits than its factorization.

66288128785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42024.

The product of its digits is 20643840, while the sum is 61.

The spelling of 66288128785 in words is "sixty-six billion, two hundred eighty-eight million, one hundred twenty-eight thousand, seven hundred eighty-five".