898661866 has 4 divisors (see below), whose sum is σ = 1347992802. Its totient is φ = 449330932.

The previous prime is 898661861. The next prime is 898661887. The reversal of 898661866 is 668166898.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 846519025 + 52142841 = 29095^2 + 7221^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 898661866.

It is not an unprimeable number, because it can be changed into a prime (898661861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224665465 + ... + 224665468.

Almost surely, 2^898661866 is an apocalyptic number.

898661866 is a deficient number, since it is larger than the sum of its proper divisors (449330936).

898661866 is a wasteful number, since it uses less digits than its factorization.

898661866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449330935.

The product of its digits is 5971968, while the sum is 58.

The square root of 898661866 is about 29977.6894706714. The cubic root of 898661866 is about 965.0106457165.

The spelling of 898661866 in words is "eight hundred ninety-eight million, six hundred sixty-one thousand, eight hundred sixty-six".