2174144801561 has 2 divisors, whose sum is σ = 2174144801562. Its totient is φ = 2174144801560.

The previous prime is 2174144801539. The next prime is 2174144801641. The reversal of 2174144801561 is 1651084414712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1899090705625 + 275054095936 = 1378075^2 + 524456^2 .

It is a cyclic number.

It is not a de Polignac number, because 2174144801561 - 2¹⁴ = 2174144785177 is a prime.

It is not a weakly prime, because it can be changed into another prime (2174144801531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087072400780 + 1087072400781.

It is an arithmetic number, because the mean of its divisors is an integer number (1087072400781).

Almost surely, 2^{2174144801561} is an apocalyptic number.

It is an amenable number.

2174144801561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2174144801561 is an equidigital number, since it uses as much as digits as its factorization.

2174144801561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 2174144801561 in words is "two trillion, one hundred seventy-four billion, one hundred forty-four million, eight hundred one thousand, five hundred sixty-one".