1225645116491 has 2 divisors, whose sum is σ = 1225645116492. Its totient is φ = 1225645116490.

The previous prime is 1225645116467. The next prime is 1225645116541. The reversal of 1225645116491 is 1946115465221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225645116491 - 2²⁶ = 1225578007627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1225645113491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612822558245 + 612822558246.

It is an arithmetic number, because the mean of its divisors is an integer number (612822558246).

Almost surely, 2^{1225645116491} is an apocalyptic number.

1225645116491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225645116491 is an equidigital number, since it uses as much as digits as its factorization.

1225645116491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 47.

The spelling of 1225645116491 in words is "one trillion, two hundred twenty-five billion, six hundred forty-five million, one hundred sixteen thousand, four hundred ninety-one".