66388288771 has 8 divisors (see below), whose sum is σ = 76043602944. Its totient is φ = 56775792840.

The previous prime is 66388288753. The next prime is 66388288777. The reversal of 66388288771 is 17788288366.

It is a happy number.

66388288771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66388288771 - 2¹⁹ = 66387764483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66388288777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10701235 + ... + 10707436.

It is an arithmetic number, because the mean of its divisors is an integer number (9505450368).

Almost surely, 2^66388288771 is an apocalyptic number.

66388288771 is a deficient number, since it is larger than the sum of its proper divisors (9655314173).

66388288771 is a wasteful number, since it uses less digits than its factorization.

66388288771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21409121.

The product of its digits is 43352064, while the sum is 64.

The spelling of 66388288771 in words is "sixty-six billion, three hundred eighty-eight million, two hundred eighty-eight thousand, seven hundred seventy-one".