8250721065 has 24 divisors (see below), whose sum is σ = 14303727360. Its totient is φ = 4399622304.

The previous prime is 8250721051. The next prime is 8250721093. The reversal of 8250721065 is 5601270528.

It is a happy number.

8250721065 is a `hidden beast` number, since 82 + 507 + 2 + 10 + 65 = 666.

It is not a de Polignac number, because 8250721065 - 2⁵ = 8250721033 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 329146 + ... + 353324.

It is an arithmetic number, because the mean of its divisors is an integer number (595988640).

Almost surely, 2^8250721065 is an apocalyptic number.

It is an amenable number.

8250721065 is a deficient number, since it is larger than the sum of its proper divisors (6053006295).

8250721065 is a wasteful number, since it uses less digits than its factorization.

8250721065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31773 (or 31770 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 8250721065 is about 90833.4798683833. The cubic root of 8250721065 is about 2020.6788772170.

The spelling of 8250721065 in words is "eight billion, two hundred fifty million, seven hundred twenty-one thousand, sixty-five".