166533557 has 2 divisors, whose sum is σ = 166533558. Its totient is φ = 166533556.

The previous prime is 166533551. The next prime is 166533571. The reversal of 166533557 is 755335661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122788561 + 43744996 = 11081^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 166533557 - 2¹⁰ = 166532533 is a prime.

It is a Chen prime.

It is equal to p_9319964 and since 166533557 and 9319964 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166533551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83266778 + 83266779.

It is an arithmetic number, because the mean of its divisors is an integer number (83266779).

Almost surely, 2^166533557 is an apocalyptic number.

It is an amenable number.

166533557 is a deficient number, since it is larger than the sum of its proper divisors (1).

166533557 is an equidigital number, since it uses as much as digits as its factorization.

166533557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283500, while the sum is 41.

The square root of 166533557 is about 12904.7881423912. The cubic root of 166533557 is about 550.1746629839.

The spelling of 166533557 in words is "one hundred sixty-six million, five hundred thirty-three thousand, five hundred fifty-seven".