1166160071621 has 2 divisors, whose sum is σ = 1166160071622. Its totient is φ = 1166160071620.

The previous prime is 1166160071597. The next prime is 1166160071651. The reversal of 1166160071621 is 1261700616611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 926954956225 + 239205115396 = 962785^2 + 489086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166160071621 - 2¹⁴ = 1166160055237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166160071651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583080035810 + 583080035811.

It is an arithmetic number, because the mean of its divisors is an integer number (583080035811).

Almost surely, 2^{1166160071621} is an apocalyptic number.

It is an amenable number.

1166160071621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166160071621 is an equidigital number, since it uses as much as digits as its factorization.

1166160071621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 1166160071621 in words is "one trillion, one hundred sixty-six billion, one hundred sixty million, seventy-one thousand, six hundred twenty-one".