127541033166721 has 2 divisors, whose sum is σ = 127541033166722. Its totient is φ = 127541033166720.

The previous prime is 127541033166697. The next prime is 127541033166853. The reversal of 127541033166721 is 127661330145721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91644626534400 + 35896406632321 = 9573120^2 + 5991361^2 .

It is an emirp because it is prime and its reverse (127661330145721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127541033166721 - 2¹³ = 127541033158529 is a prime.

It is not a weakly prime, because it can be changed into another prime (127541033266721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63770516583360 + 63770516583361.

It is an arithmetic number, because the mean of its divisors is an integer number (63770516583361).

Almost surely, 2^{127541033166721} is an apocalyptic number.

It is an amenable number.

127541033166721 is a deficient number, since it is larger than the sum of its proper divisors (1).

127541033166721 is an equidigital number, since it uses as much as digits as its factorization.

127541033166721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 127541033166721 in words is "one hundred twenty-seven trillion, five hundred forty-one billion, thirty-three million, one hundred sixty-six thousand, seven hundred twenty-one".