66976603 has 2 divisors, whose sum is σ = 66976604. Its totient is φ = 66976602.

The previous prime is 66976561. The next prime is 66976619. The reversal of 66976603 is 30667966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66976603 - 2¹⁷ = 66845531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66976603.

It is not a weakly prime, because it can be changed into another prime (66976003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33488301 + 33488302.

It is an arithmetic number, because the mean of its divisors is an integer number (33488302).

Almost surely, 2^66976603 is an apocalyptic number.

66976603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66976603 is an equidigital number, since it uses as much as digits as its factorization.

66976603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66976603 is about 8183.9234478336. The cubic root of 66976603 is about 406.1075269080.

The spelling of 66976603 in words is "sixty-six million, nine hundred seventy-six thousand, six hundred three".