166078433 has 2 divisors, whose sum is σ = 166078434. Its totient is φ = 166078432.

The previous prime is 166078399. The next prime is 166078489. The reversal of 166078433 is 334870661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83759104 + 82319329 = 9152^2 + 9073^2 .

It is an emirp because it is prime and its reverse (334870661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166078433 - 2⁶ = 166078369 is a prime.

It is not a weakly prime, because it can be changed into another prime (166077433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83039216 + 83039217.

It is an arithmetic number, because the mean of its divisors is an integer number (83039217).

Almost surely, 2^166078433 is an apocalyptic number.

It is an amenable number.

166078433 is a deficient number, since it is larger than the sum of its proper divisors (1).

166078433 is an equidigital number, since it uses as much as digits as its factorization.

166078433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 166078433 is about 12887.1421579806. The cubic root of 166078433 is about 549.6730100418.

The spelling of 166078433 in words is "one hundred sixty-six million, seventy-eight thousand, four hundred thirty-three".