166106557 has 2 divisors, whose sum is σ = 166106558. Its totient is φ = 166106556.

The previous prime is 166106537. The next prime is 166106561. The reversal of 166106557 is 755601661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88472836 + 77633721 = 9406^2 + 8811^2 .

It is an emirp because it is prime and its reverse (755601661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166106557 - 2¹¹ = 166104509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166106527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83053278 + 83053279.

It is an arithmetic number, because the mean of its divisors is an integer number (83053279).

Almost surely, 2^166106557 is an apocalyptic number.

It is an amenable number.

166106557 is a deficient number, since it is larger than the sum of its proper divisors (1).

166106557 is an equidigital number, since it uses as much as digits as its factorization.

166106557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 166106557 is about 12888.2332769080. The cubic root of 166106557 is about 549.7040358066.

The spelling of 166106557 in words is "one hundred sixty-six million, one hundred six thousand, five hundred fifty-seven".