7279221565 has 16 divisors (see below), whose sum is σ = 10890472320. Its totient is φ = 4537696320.

The previous prime is 7279221557. The next prime is 7279221571. The reversal of 7279221565 is 5651229727.

It is not a de Polignac number, because 7279221565 - 2³ = 7279221557 is a prime.

It is a super-2 number, since 2×7279221565² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9453150 + ... + 9453919.

It is an arithmetic number, because the mean of its divisors is an integer number (680654520).

Almost surely, 2^7279221565 is an apocalyptic number.

It is an amenable number.

7279221565 is a deficient number, since it is larger than the sum of its proper divisors (3611250755).

7279221565 is a wasteful number, since it uses less digits than its factorization.

7279221565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18907092.

The product of its digits is 529200, while the sum is 46.

The square root of 7279221565 is about 85318.3542093962. The cubic root of 7279221565 is about 1938.0351350964.

The spelling of 7279221565 in words is "seven billion, two hundred seventy-nine million, two hundred twenty-one thousand, five hundred sixty-five".