66864489910 has 16 divisors (see below), whose sum is σ = 120363366816. Its totient is φ = 26744177088.

The previous prime is 66864489907. The next prime is 66864489911. The reversal of 66864489910 is 1998446866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66864489911) 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, 21162 + ... + 366301.

It is an arithmetic number, because the mean of its divisors is an integer number (7522710426).

Almost surely, 2^66864489910 is an apocalyptic number.

66864489910 is a deficient number, since it is larger than the sum of its proper divisors (53498876906).

66864489910 is a wasteful number, since it uses less digits than its factorization.

66864489910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404727.

The product of its (nonzero) digits is 17915904, while the sum is 61.

The spelling of 66864489910 in words is "sixty-six billion, eight hundred sixty-four million, four hundred eighty-nine thousand, nine hundred ten".