871666603 has 2 divisors, whose sum is σ = 871666604. Its totient is φ = 871666602.

The previous prime is 871666573. The next prime is 871666613. The reversal of 871666603 is 306666178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 871666603 - 2⁵ = 871666571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 871666603.

It is not a weakly prime, because it can be changed into another prime (871666613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435833301 + 435833302.

It is an arithmetic number, because the mean of its divisors is an integer number (435833302).

Almost surely, 2^871666603 is an apocalyptic number.

871666603 is a deficient number, since it is larger than the sum of its proper divisors (1).

871666603 is an equidigital number, since it uses as much as digits as its factorization.

871666603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 871666603 is about 29524.0004572551. Note that the first 3 decimals coincide. The cubic root of 871666603 is about 955.2494630777.

The spelling of 871666603 in words is "eight hundred seventy-one million, six hundred sixty-six thousand, six hundred three".