2011006166621 has 2 divisors, whose sum is σ = 2011006166622. Its totient is φ = 2011006166620.

The previous prime is 2011006166501. The next prime is 2011006166639. The reversal of 2011006166621 is 1266616001102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1517851104121 + 493155062500 = 1232011^2 + 702250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011006166621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011006166921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005503083310 + 1005503083311.

It is an arithmetic number, because the mean of its divisors is an integer number (1005503083311).

Almost surely, 2^{2011006166621} is an apocalyptic number.

It is an amenable number.

2011006166621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011006166621 is an equidigital number, since it uses as much as digits as its factorization.

2011006166621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 2011006166621 in words is "two trillion, eleven billion, six million, one hundred sixty-six thousand, six hundred twenty-one".