166390153 has 2 divisors, whose sum is σ = 166390154. Its totient is φ = 166390152.

The previous prime is 166390151. The next prime is 166390171. The reversal of 166390153 is 351093661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85155984 + 81234169 = 9228^2 + 9013^2 .

It is a cyclic number.

It is not a de Polignac number, because 166390153 - 2¹ = 166390151 is a prime.

Together with 166390151, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166390151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83195076 + 83195077.

It is an arithmetic number, because the mean of its divisors is an integer number (83195077).

Almost surely, 2^166390153 is an apocalyptic number.

It is an amenable number.

166390153 is a deficient number, since it is larger than the sum of its proper divisors (1).

166390153 is an equidigital number, since it uses as much as digits as its factorization.

166390153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 166390153 is about 12899.2307134961. The cubic root of 166390153 is about 550.0166970138.

The spelling of 166390153 in words is "one hundred sixty-six million, three hundred ninety thousand, one hundred fifty-three".