127158066661 has 2 divisors, whose sum is σ = 127158066662. Its totient is φ = 127158066660.

The previous prime is 127158066649. The next prime is 127158066677. The reversal of 127158066661 is 166660851721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122644242436 + 4513824225 = 350206^2 + 67185^2 .

It is a cyclic number.

It is not a de Polignac number, because 127158066661 - 2¹⁷ = 127157935589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127158066691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63579033330 + 63579033331.

It is an arithmetic number, because the mean of its divisors is an integer number (63579033331).

Almost surely, 2^127158066661 is an apocalyptic number.

It is an amenable number.

127158066661 is a deficient number, since it is larger than the sum of its proper divisors (1).

127158066661 is an equidigital number, since it uses as much as digits as its factorization.

127158066661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 127158066661 in words is "one hundred twenty-seven billion, one hundred fifty-eight million, sixty-six thousand, six hundred sixty-one".