66895603 has 2 divisors, whose sum is σ = 66895604. Its totient is φ = 66895602.

The previous prime is 66895601. The next prime is 66895627. The reversal of 66895603 is 30659866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66895603 - 2¹ = 66895601 is a prime.

Together with 66895601, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66895603.

It is not a weakly prime, because it can be changed into another prime (66895601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33447801 + 33447802.

It is an arithmetic number, because the mean of its divisors is an integer number (33447802).

Almost surely, 2^66895603 is an apocalyptic number.

66895603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66895603 is an equidigital number, since it uses as much as digits as its factorization.

66895603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 66895603 is about 8178.9732240667. The cubic root of 66895603 is about 405.9437484250.

The spelling of 66895603 in words is "sixty-six million, eight hundred ninety-five thousand, six hundred three".