2175868721641 has 2 divisors, whose sum is σ = 2175868721642. Its totient is φ = 2175868721640.

The previous prime is 2175868721633. The next prime is 2175868721647. The reversal of 2175868721641 is 1461278685712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2167876361641 + 7992360000 = 1472371^2 + 89400^2 .

It is a cyclic number.

It is not a de Polignac number, because 2175868721641 - 2³ = 2175868721633 is a prime.

It is not a weakly prime, because it can be changed into another prime (2175868721647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1087934360820 + 1087934360821.

It is an arithmetic number, because the mean of its divisors is an integer number (1087934360821).

Almost surely, 2^{2175868721641} is an apocalyptic number.

It is an amenable number.

2175868721641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2175868721641 is an equidigital number, since it uses as much as digits as its factorization.

2175868721641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 58.

The spelling of 2175868721641 in words is "two trillion, one hundred seventy-five billion, eight hundred sixty-eight million, seven hundred twenty-one thousand, six hundred forty-one".