66863836806 has 16 divisors (see below), whose sum is σ = 144014417904. Its totient is φ = 20573488224.

The previous prime is 66863836763. The next prime is 66863836817. The reversal of 66863836806 is 60863836866.

66863836806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66863836806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428614261 + ... + 428614416.

It is an arithmetic number, because the mean of its divisors is an integer number (9000901119).

Almost surely, 2^66863836806 is an apocalyptic number.

66863836806 is an abundant number, since it is smaller than the sum of its proper divisors (77150581098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66863836806 is a wasteful number, since it uses less digits than its factorization.

66863836806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857228695.

The product of its (nonzero) digits is 35831808, while the sum is 60.

Adding to 66863836806 its sum of digits (60), we get a palindrome (66863836866).

The spelling of 66863836806 in words is "sixty-six billion, eight hundred sixty-three million, eight hundred thirty-six thousand, eight hundred six".