1225646465221 has 2 divisors, whose sum is σ = 1225646465222. Its totient is φ = 1225646465220.

The previous prime is 1225646465213. The next prime is 1225646465261.

It is a happy number.

1225646465221 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961352796196 + 264293669025 = 980486^2 + 514095^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1225646465221 - 2³ = 1225646465213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225646465261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612823232610 + 612823232611.

It is an arithmetic number, because the mean of its divisors is an integer number (612823232611).

Almost surely, 2^{1225646465221} is an apocalyptic number.

It is an amenable number.

1225646465221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225646465221 is an equidigital number, since it uses as much as digits as its factorization.

1225646465221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 46.

The spelling of 1225646465221 in words is "one trillion, two hundred twenty-five billion, six hundred forty-six million, four hundred sixty-five thousand, two hundred twenty-one".