1065166170721 has 2 divisors, whose sum is σ = 1065166170722. Its totient is φ = 1065166170720.

The previous prime is 1065166170703. The next prime is 1065166170763. The reversal of 1065166170721 is 1270716615601.

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., 583718920225 + 481447250496 = 764015^2 + 693864^2 .

It is an emirp because it is prime and its reverse (1270716615601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1065166170721 - 2⁵ = 1065166170689 is a prime.

It is a super-2 number, since 2×1065166170721² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1065166870721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532583085360 + 532583085361.

It is an arithmetic number, because the mean of its divisors is an integer number (532583085361).

Almost surely, 2^{1065166170721} is an apocalyptic number.

It is an amenable number.

1065166170721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065166170721 is an equidigital number, since it uses as much as digits as its factorization.

1065166170721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 1065166170721 in words is "one trillion, sixty-five billion, one hundred sixty-six million, one hundred seventy thousand, seven hundred twenty-one".