866747668 has 6 divisors (see below), whose sum is σ = 1516808426. Its totient is φ = 433373832.

The previous prime is 866747657. The next prime is 866747677.

It is a happy number.

866747668 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 510217744 + 356529924 = 22588^2 + 18882^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108343455 + ... + 108343462.

Almost surely, 2^866747668 is an apocalyptic number.

It is an amenable number.

866747668 is a deficient number, since it is larger than the sum of its proper divisors (650060758).

866747668 is a wasteful number, since it uses less digits than its factorization.

866747668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216686921 (or 216686919 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 58.

The square root of 866747668 is about 29440.5785948578. The cubic root of 866747668 is about 953.4492042425.

The spelling of 866747668 in words is "eight hundred sixty-six million, seven hundred forty-seven thousand, six hundred sixty-eight".