7226815681 has 4 divisors (see below), whose sum is σ = 7227135364. Its totient is φ = 7226496000.

The previous prime is 7226815679. The next prime is 7226815703. The reversal of 7226815681 is 1865186227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1149210000 + 6077605681 = 33900^2 + 77959^2 .

It is a cyclic number.

It is not a de Polignac number, because 7226815681 - 2¹ = 7226815679 is a prime.

It is a super-3 number, since 3×7226815681³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7226815601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123120 + ... + 172081.

It is an arithmetic number, because the mean of its divisors is an integer number (1806783841).

Almost surely, 2^7226815681 is an apocalyptic number.

It is an amenable number.

7226815681 is a deficient number, since it is larger than the sum of its proper divisors (319683).

7226815681 is a wasteful number, since it uses less digits than its factorization.

7226815681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319682.

The product of its digits is 322560, while the sum is 46.

The square root of 7226815681 is about 85010.6798055397. The cubic root of 7226815681 is about 1933.3730451184.

The spelling of 7226815681 in words is "seven billion, two hundred twenty-six million, eight hundred fifteen thousand, six hundred eighty-one".