66541603 has 2 divisors, whose sum is σ = 66541604. Its totient is φ = 66541602.

The previous prime is 66541589. The next prime is 66541627. The reversal of 66541603 is 30614566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66541603 - 2⁵ = 66541571 is a prime.

It is not a weakly prime, because it can be changed into another prime (66541693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33270801 + 33270802.

It is an arithmetic number, because the mean of its divisors is an integer number (33270802).

Almost surely, 2^66541603 is an apocalyptic number.

66541603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66541603 is an equidigital number, since it uses as much as digits as its factorization.

66541603 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 31.

The square root of 66541603 is about 8157.3036599112. The cubic root of 66541603 is about 405.2264201597.

The spelling of 66541603 in words is "sixty-six million, five hundred forty-one thousand, six hundred three".