166506433 has 2 divisors, whose sum is σ = 166506434. Its totient is φ = 166506432.

The previous prime is 166506421. The next prime is 166506491. The reversal of 166506433 is 334605661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124813584 + 41692849 = 11172^2 + 6457^2 .

It is a cyclic number.

It is not a de Polignac number, because 166506433 - 2²¹ = 164409281 is a prime.

It is not a weakly prime, because it can be changed into another prime (166506493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83253216 + 83253217.

It is an arithmetic number, because the mean of its divisors is an integer number (83253217).

Almost surely, 2^166506433 is an apocalyptic number.

It is an amenable number.

166506433 is a deficient number, since it is larger than the sum of its proper divisors (1).

166506433 is an equidigital number, since it uses as much as digits as its factorization.

166506433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 166506433 is about 12903.7371718429. The cubic root of 166506433 is about 550.1447916312.

The spelling of 166506433 in words is "one hundred sixty-six million, five hundred six thousand, four hundred thirty-three".