225720079691 has 2 divisors, whose sum is σ = 225720079692. Its totient is φ = 225720079690.

The previous prime is 225720079649. The next prime is 225720079693. The reversal of 225720079691 is 196970027522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225720079691 - 2¹⁰ = 225720078667 is a prime.

It is a super-2 number, since 2×225720079691² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 225720079693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225720079693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112860039845 + 112860039846.

It is an arithmetic number, because the mean of its divisors is an integer number (112860039846).

Almost surely, 2^225720079691 is an apocalyptic number.

225720079691 is a deficient number, since it is larger than the sum of its proper divisors (1).

225720079691 is an equidigital number, since it uses as much as digits as its factorization.

225720079691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 50.

The spelling of 225720079691 in words is "two hundred twenty-five billion, seven hundred twenty million, seventy-nine thousand, six hundred ninety-one".