66863836865 has 16 divisors (see below), whose sum is σ = 91710462720. Its totient is φ = 45843744960.

The previous prime is 66863836861. The next prime is 66863836877. The reversal of 66863836865 is 56863836866.

66863836865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66863836865 - 2² = 66863836861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66863836861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173900 + ... + 404930.

It is an arithmetic number, because the mean of its divisors is an integer number (5731903920).

Almost surely, 2^66863836865 is an apocalyptic number.

It is an amenable number.

66863836865 is a deficient number, since it is larger than the sum of its proper divisors (24846625855).

66863836865 is a wasteful number, since it uses less digits than its factorization.

66863836865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239312.

The product of its digits is 179159040, while the sum is 65.

Subtracting from 66863836865 its reverse (56863836866), we obtain a palindrome (9999999999).

The spelling of 66863836865 in words is "sixty-six billion, eight hundred sixty-three million, eight hundred thirty-six thousand, eight hundred sixty-five".