166541603 has 2 divisors, whose sum is σ = 166541604. Its totient is φ = 166541602.

The previous prime is 166541591. The next prime is 166541629. The reversal of 166541603 is 306145661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166541603 - 2⁴ = 166541587 is a prime.

It is a super-2 number, since 2×166541603² = 55472211059619218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166541603.

It is not a weakly prime, because it can be changed into another prime (166541663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83270801 + 83270802.

It is an arithmetic number, because the mean of its divisors is an integer number (83270802).

Almost surely, 2^166541603 is an apocalyptic number.

166541603 is a deficient number, since it is larger than the sum of its proper divisors (1).

166541603 is an equidigital number, since it uses as much as digits as its factorization.

166541603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 166541603 is about 12905.0998833794. The cubic root of 166541603 is about 550.1835233284.

The spelling of 166541603 in words is "one hundred sixty-six million, five hundred forty-one thousand, six hundred three".