166988033521 has 2 divisors, whose sum is σ = 166988033522. Its totient is φ = 166988033520.

The previous prime is 166988033461. The next prime is 166988033561. The reversal of 166988033521 is 125330889661.

166988033521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91204000000 + 75784033521 = 302000^2 + 275289^2 .

It is a cyclic number.

It is not a de Polignac number, because 166988033521 - 2²⁹ = 166451162609 is a prime.

It is not a weakly prime, because it can be changed into another prime (166988033561) 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, 83494016760 + 83494016761.

It is an arithmetic number, because the mean of its divisors is an integer number (83494016761).

Almost surely, 2^166988033521 is an apocalyptic number.

It is an amenable number.

166988033521 is a deficient number, since it is larger than the sum of its proper divisors (1).

166988033521 is an equidigital number, since it uses as much as digits as its factorization.

166988033521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 166988033521 in words is "one hundred sixty-six billion, nine hundred eighty-eight million, thirty-three thousand, five hundred twenty-one".