65221064 has 8 divisors (see below), whose sum is σ = 122289510. Its totient is φ = 32610528.

The previous prime is 65221063. The next prime is 65221073. The reversal of 65221064 is 46012256.

65221064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 51008164 + 14212900 = 7142^2 + 3770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (65221063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4076309 + ... + 4076324.

Almost surely, 2^65221064 is an apocalyptic number.

It is an amenable number.

65221064 is a deficient number, since it is larger than the sum of its proper divisors (57068446).

65221064 is a wasteful number, since it uses less digits than its factorization.

65221064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152639 (or 8152635 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 65221064 is about 8075.9559186514. The cubic root of 65221064 is about 402.5278743089.

The spelling of 65221064 in words is "sixty-five million, two hundred twenty-one thousand, sixty-four".