1125445566221 has 2 divisors, whose sum is σ = 1125445566222. Its totient is φ = 1125445566220.

The previous prime is 1125445566197. The next prime is 1125445566233. The reversal of 1125445566221 is 1226655445211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 875431566025 + 250014000196 = 935645^2 + 500014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125445566221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125445566281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562722783110 + 562722783111.

It is an arithmetic number, because the mean of its divisors is an integer number (562722783111).

Almost surely, 2^{1125445566221} is an apocalyptic number.

It is an amenable number.

1125445566221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125445566221 is an equidigital number, since it uses as much as digits as its factorization.

1125445566221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576000, while the sum is 44.

It can be divided in two parts, 112544 and 5566221, that added together give a palindrome (5678765).

The spelling of 1125445566221 in words is "one trillion, one hundred twenty-five billion, four hundred forty-five million, five hundred sixty-six thousand, two hundred twenty-one".