4245222500261 has 2 divisors, whose sum is σ = 4245222500262. Its totient is φ = 4245222500260.

The previous prime is 4245222500191. The next prime is 4245222500263. The reversal of 4245222500261 is 1620052225424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3876937372036 + 368285128225 = 1968994^2 + 606865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4245222500261 is a prime.

It is a super-2 number, since 2×4245222500261² (a number of 26 digits) contains 22 as substring.

Together with 4245222500263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4245222500263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2122611250130 + 2122611250131.

It is an arithmetic number, because the mean of its divisors is an integer number (2122611250131).

Almost surely, 2^{4245222500261} is an apocalyptic number.

It is an amenable number.

4245222500261 is a deficient number, since it is larger than the sum of its proper divisors (1).

4245222500261 is an equidigital number, since it uses as much as digits as its factorization.

4245222500261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 4245222500261 its reverse (1620052225424), we get a palindrome (5865274725685).

The spelling of 4245222500261 in words is "four trillion, two hundred forty-five billion, two hundred twenty-two million, five hundred thousand, two hundred sixty-one".