66888852017 has 4 divisors (see below), whose sum is σ = 72034148340. Its totient is φ = 61743555696.

The previous prime is 66888851969. The next prime is 66888852029. The reversal of 66888852017 is 71025888866.

66888852017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3181072801 + 63707779216 = 56401^2 + 252404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66888852017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66888252017) 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, 2572648142 + ... + 2572648167.

It is an arithmetic number, because the mean of its divisors is an integer number (18008537085).

Almost surely, 2^66888852017 is an apocalyptic number.

It is an amenable number.

66888852017 is a deficient number, since it is larger than the sum of its proper divisors (5145296323).

66888852017 is a wasteful number, since it uses less digits than its factorization.

66888852017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145296322.

The product of its (nonzero) digits is 10321920, while the sum is 59.

The spelling of 66888852017 in words is "sixty-six billion, eight hundred eighty-eight million, eight hundred fifty-two thousand, seventeen".