7265165221 has 4 divisors (see below), whose sum is σ = 7268330412. Its totient is φ = 7262000032.

The previous prime is 7265165207. The next prime is 7265165251. The reversal of 7265165221 is 1225615627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1225615627 = 43 ⋅28502689.

It can be written as a sum of positive squares in 2 ways, for example, as 2570997025 + 4694168196 = 50705^2 + 68514^2 .

It is a cyclic number.

It is not a de Polignac number, because 7265165221 - 2⁵ = 7265165189 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 (7265165251) 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, 1579150 + ... + 1583743.

It is an arithmetic number, because the mean of its divisors is an integer number (1817082603).

Almost surely, 2^7265165221 is an apocalyptic number.

It is an amenable number.

7265165221 is a deficient number, since it is larger than the sum of its proper divisors (3165191).

7265165221 is a wasteful number, since it uses less digits than its factorization.

7265165221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165190.

The product of its digits is 50400, while the sum is 37.

The square root of 7265165221 is about 85235.9385529367. The cubic root of 7265165221 is about 1936.7868678235.

The spelling of 7265165221 in words is "seven billion, two hundred sixty-five million, one hundred sixty-five thousand, two hundred twenty-one".