64660420044223 has 4 divisors (see below), whose sum is σ = 64738606768200. Its totient is φ = 64582233320248.

The previous prime is 64660420044217. The next prime is 64660420044257. The reversal of 64660420044223 is 32244002406646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64660420044223 - 2²⁵ = 64660386489791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64660420044223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64660420044523) 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, 39093360748 + ... + 39093362401.

It is an arithmetic number, because the mean of its divisors is an integer number (16184651692050).

Almost surely, 2^{64660420044223} is an apocalyptic number.

64660420044223 is a deficient number, since it is larger than the sum of its proper divisors (78186723977).

64660420044223 is an equidigital number, since it uses as much as digits as its factorization.

64660420044223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78186723976.

The product of its (nonzero) digits is 1327104, while the sum is 43.

The spelling of 64660420044223 in words is "sixty-four trillion, six hundred sixty billion, four hundred twenty million, forty-four thousand, two hundred twenty-three".