65221505 has 16 divisors (see below), whose sum is σ = 79936848. Its totient is φ = 51072000.

The previous prime is 65221501. The next prime is 65221511. The reversal of 65221505 is 50512256.

65221505 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 8 ways, for example, as 23902321 + 41319184 = 4889^2 + 6428^2 .

It is not a de Polignac number, because 65221505 - 2² = 65221501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65221501) 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 in 15 ways as a sum of consecutive naturals, for example, 85325 + ... + 86085.

It is an arithmetic number, because the mean of its divisors is an integer number (4996053).

Almost surely, 2^65221505 is an apocalyptic number.

It is an amenable number.

65221505 is a deficient number, since it is larger than the sum of its proper divisors (14715343).

65221505 is a wasteful number, since it uses less digits than its factorization.

65221505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 65221505 is about 8075.9832218746. The cubic root of 65221505 is about 402.5287815536.

The spelling of 65221505 in words is "sixty-five million, two hundred twenty-one thousand, five hundred five".