866161668 has 24 divisors (see below), whose sum is σ = 2032339680. Its totient is φ = 287106880.

The previous prime is 866161663. The next prime is 866161691.

It is a happy number.

866161668 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×866161668² = 1500472070225084448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866161661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199473 + ... + 203768.

It is an arithmetic number, because the mean of its divisors is an integer number (84680820).

Almost surely, 2^866161668 is an apocalyptic number.

It is an amenable number.

866161668 is an abundant number, since it is smaller than the sum of its proper divisors (1166178012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866161668 is a wasteful number, since it uses less digits than its factorization.

866161668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403427 (or 403425 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 866161668 is about 29430.6246620761. The cubic root of 866161668 is about 953.2342831003.

The spelling of 866161668 in words is "eight hundred sixty-six million, one hundred sixty-one thousand, six hundred sixty-eight".