665876886 has 16 divisors (see below), whose sum is σ = 1335958704. Its totient is φ = 221258144.

The previous prime is 665876881. The next prime is 665876903. The reversal of 665876886 is 688678566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665876881) 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, 173145 + ... + 176948.

It is an arithmetic number, because the mean of its divisors is an integer number (83497419).

Almost surely, 2^665876886 is an apocalyptic number.

665876886 is an abundant number, since it is smaller than the sum of its proper divisors (670081818).

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

665876886 is a wasteful number, since it uses less digits than its factorization.

665876886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350415.

The product of its digits is 23224320, while the sum is 60.

The square root of 665876886 is about 25804.5904055848. The cubic root of 665876886 is about 873.2353599409.

The spelling of 665876886 in words is "six hundred sixty-five million, eight hundred seventy-six thousand, eight hundred eighty-six".