899666791 has 2 divisors, whose sum is σ = 899666792. Its totient is φ = 899666790.

The previous prime is 899666783. The next prime is 899666839. The reversal of 899666791 is 197666998.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 899666791 - 2³ = 899666783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899666771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449833395 + 449833396.

It is an arithmetic number, because the mean of its divisors is an integer number (449833396).

Almost surely, 2^899666791 is an apocalyptic number.

899666791 is a deficient number, since it is larger than the sum of its proper divisors (1).

899666791 is an equidigital number, since it uses as much as digits as its factorization.

899666791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 61.

The square root of 899666791 is about 29994.4460025519. The cubic root of 899666791 is about 965.3702181379.

The spelling of 899666791 in words is "eight hundred ninety-nine million, six hundred sixty-six thousand, seven hundred ninety-one".