64881185661223 has 4 divisors (see below), whose sum is σ = 64881477415168. Its totient is φ = 64880893907280.

The previous prime is 64881185661199. The next prime is 64881185661283. The reversal of 64881185661223 is 32216658118846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64881185661223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64881185661283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145543143 + ... + 145988248.

It is an arithmetic number, because the mean of its divisors is an integer number (16220369353792).

Almost surely, 2^{64881185661223} is an apocalyptic number.

64881185661223 is a deficient number, since it is larger than the sum of its proper divisors (291753945).

64881185661223 is a wasteful number, since it uses less digits than its factorization.

64881185661223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291753944.

The product of its digits is 26542080, while the sum is 61.

The spelling of 64881185661223 in words is "sixty-four trillion, eight hundred eighty-one billion, one hundred eighty-five million, six hundred sixty-one thousand, two hundred twenty-three".