166527661 has 2 divisors, whose sum is σ = 166527662. Its totient is φ = 166527660.

The previous prime is 166527649. The next prime is 166527667. The reversal of 166527661 is 166725661.

166527661 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., 105781225 + 60746436 = 10285^2 + 7794^2 .

It is an emirp because it is prime and its reverse (166725661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166527661 - 2⁹ = 166527149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166527667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83263830 + 83263831.

It is an arithmetic number, because the mean of its divisors is an integer number (83263831).

Almost surely, 2^166527661 is an apocalyptic number.

It is an amenable number.

166527661 is a deficient number, since it is larger than the sum of its proper divisors (1).

166527661 is an equidigital number, since it uses as much as digits as its factorization.

166527661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 166527661 is about 12904.5596980292. The cubic root of 166527661 is about 550.1681700621.

The spelling of 166527661 in words is "one hundred sixty-six million, five hundred twenty-seven thousand, six hundred sixty-one".