226405400261 has 2 divisors, whose sum is σ = 226405400262. Its totient is φ = 226405400260.

The previous prime is 226405400251. The next prime is 226405400317. The reversal of 226405400261 is 162004504622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181966230625 + 44439169636 = 426575^2 + 210806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-226405400261 is a prime.

It is a super-3 number, since 3×226405400261³ (a number of 35 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (226405400201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113202700130 + 113202700131.

It is an arithmetic number, because the mean of its divisors is an integer number (113202700131).

Almost surely, 2^226405400261 is an apocalyptic number.

It is an amenable number.

226405400261 is a deficient number, since it is larger than the sum of its proper divisors (1).

226405400261 is an equidigital number, since it uses as much as digits as its factorization.

226405400261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 226405400261 its reverse (162004504622), we get a palindrome (388409904883).

The spelling of 226405400261 in words is "two hundred twenty-six billion, four hundred five million, four hundred thousand, two hundred sixty-one".