811371668 has 24 divisors (see below), whose sum is σ = 1535032800. Its totient is φ = 373945248.

The previous prime is 811371641. The next prime is 811371689. The reversal of 811371668 is 866173118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141458 + ... + 147081.

It is an arithmetic number, because the mean of its divisors is an integer number (63959700).

Almost surely, 2^811371668 is an apocalyptic number.

It is an amenable number.

811371668 is a deficient number, since it is larger than the sum of its proper divisors (723661132).

811371668 is a wasteful number, since it uses less digits than its factorization.

811371668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288599 (or 288597 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 811371668 is about 28484.5864986663. The cubic root of 811371668 is about 932.6956391719.

The spelling of 811371668 in words is "eight hundred eleven million, three hundred seventy-one thousand, six hundred sixty-eight".