811220668 has 6 divisors (see below), whose sum is σ = 1419636176. Its totient is φ = 405610332.

The previous prime is 811220651. The next prime is 811220681. The reversal of 811220668 is 866022118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101402580 + ... + 101402587.

Almost surely, 2^811220668 is an apocalyptic number.

It is an amenable number.

811220668 is a deficient number, since it is larger than the sum of its proper divisors (608415508).

811220668 is a wasteful number, since it uses less digits than its factorization.

811220668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202805171 (or 202805169 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 811220668 is about 28481.9358190415. The cubic root of 811220668 is about 932.6377759325.

The spelling of 811220668 in words is "eight hundred eleven million, two hundred twenty thousand, six hundred sixty-eight".