2145111775361 has 2 divisors, whose sum is σ = 2145111775362. Its totient is φ = 2145111775360.

The previous prime is 2145111775357. The next prime is 2145111775439. The reversal of 2145111775361 is 1635771115412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1427202958336 + 717908817025 = 1194656^2 + 847295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145111775361 - 2² = 2145111775357 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145111775061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072555887680 + 1072555887681.

It is an arithmetic number, because the mean of its divisors is an integer number (1072555887681).

Almost surely, 2^{2145111775361} is an apocalyptic number.

It is an amenable number.

2145111775361 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145111775361 is an equidigital number, since it uses as much as digits as its factorization.

2145111775361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 44.

The spelling of 2145111775361 in words is "two trillion, one hundred forty-five billion, one hundred eleven million, seven hundred seventy-five thousand, three hundred sixty-one".