64775622881 has 4 divisors (see below), whose sum is σ = 66355516164. Its totient is φ = 63195729600.

The previous prime is 64775622841. The next prime is 64775622883. The reversal of 64775622881 is 18822657746.

64775622881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13319237281 + 51456385600 = 115409^2 + 226840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64775622881 is a prime.

It is a super-2 number, since 2×64775622881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64775622883) 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, 789946580 + ... + 789946661.

It is an arithmetic number, because the mean of its divisors is an integer number (16588879041).

Almost surely, 2^64775622881 is an apocalyptic number.

It is an amenable number.

64775622881 is a deficient number, since it is larger than the sum of its proper divisors (1579893283).

64775622881 is a wasteful number, since it uses less digits than its factorization.

64775622881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579893282.

The product of its digits is 9031680, while the sum is 56.

The spelling of 64775622881 in words is "sixty-four billion, seven hundred seventy-five million, six hundred twenty-two thousand, eight hundred eighty-one".