166545019 has 2 divisors, whose sum is σ = 166545020. Its totient is φ = 166545018.

The previous prime is 166545011. The next prime is 166545031. The reversal of 166545019 is 910545661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166545019 - 2³ = 166545011 is a prime.

It is a super-2 number, since 2×166545019² = 55474486707420722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166545011) 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, 83272509 + 83272510.

It is an arithmetic number, because the mean of its divisors is an integer number (83272510).

Almost surely, 2^166545019 is an apocalyptic number.

166545019 is a deficient number, since it is larger than the sum of its proper divisors (1).

166545019 is an equidigital number, since it uses as much as digits as its factorization.

166545019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 166545019 is about 12905.2322334780. The cubic root of 166545019 is about 550.1872849792.

The spelling of 166545019 in words is "one hundred sixty-six million, five hundred forty-five thousand, nineteen".