64220175889 has 3 divisors (see below), whose sum is σ = 64220429307. Its totient is φ = 64219922472.

The previous prime is 64220175881. The next prime is 64220175907. The reversal of 64220175889 is 98857102246.

The square root of 64220175889 is 253417.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 10214134225 + 54006041664 = 101065^2 + 232392^2 .

It is not a de Polignac number, because 64220175889 - 2³ = 64220175881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64220175881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 126709 + ... + 380125.

It is an arithmetic number, because the mean of its divisors is an integer number (21406809769).

Almost surely, 2^64220175889 is an apocalyptic number.

64220175889 is the 253417-th square number.

64220175889 is the 126709-th centered octagonal number.

It is an amenable number.

64220175889 is a deficient number, since it is larger than the sum of its proper divisors (253418).

64220175889 is an frugal number, since it uses more digits than its factorization.

64220175889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506834 (or 253417 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 64220175889 in words is "sixty-four billion, two hundred twenty million, one hundred seventy-five thousand, eight hundred eighty-nine".