866121668 has 12 divisors (see below), whose sum is σ = 1516462080. Its totient is φ = 432846792.

The previous prime is 866121647. The next prime is 866121671.

866121668 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44228 + ... + 60731.

It is an arithmetic number, because the mean of its divisors is an integer number (126371840).

Almost surely, 2^866121668 is an apocalyptic number.

It is an amenable number.

866121668 is a deficient number, since it is larger than the sum of its proper divisors (650340412).

866121668 is a wasteful number, since it uses less digits than its factorization.

866121668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107026 (or 107024 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 866121668 is about 29429.9450899929. The cubic root of 866121668 is about 953.2196091814.

The spelling of 866121668 in words is "eight hundred sixty-six million, one hundred twenty-one thousand, six hundred sixty-eight".