821863166 has 8 divisors (see below), whose sum is σ = 1266113640. Its totient is φ = 399825288.

The previous prime is 821863123. The next prime is 821863201. The reversal of 821863166 is 661368128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 5553056 + ... + 5553203.

It is an arithmetic number, because the mean of its divisors is an integer number (158264205).

Almost surely, 2^821863166 is an apocalyptic number.

821863166 is a deficient number, since it is larger than the sum of its proper divisors (444250474).

821863166 is a wasteful number, since it uses less digits than its factorization.

821863166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11106298.

The product of its digits is 82944, while the sum is 41.

The square root of 821863166 is about 28668.1559574382. The cubic root of 821863166 is about 936.6985305681.

The spelling of 821863166 in words is "eight hundred twenty-one million, eight hundred sixty-three thousand, one hundred sixty-six".