820466661 has 8 divisors (see below), whose sum is σ = 1250234944. Its totient is φ = 468838080.

The previous prime is 820466651. The next prime is 820466663. The reversal of 820466661 is 166664028.

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

It is not a de Polignac number, because 820466661 - 2⁵ = 820466629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820466663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19534900 + ... + 19534941.

It is an arithmetic number, because the mean of its divisors is an integer number (156279368).

Almost surely, 2^820466661 is an apocalyptic number.

It is an amenable number.

820466661 is a deficient number, since it is larger than the sum of its proper divisors (429768283).

820466661 is a wasteful number, since it uses less digits than its factorization.

820466661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39069851.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 820466661 is about 28643.7892220984. The cubic root of 820466661 is about 936.1676855956.

The spelling of 820466661 in words is "eight hundred twenty million, four hundred sixty-six thousand, six hundred sixty-one".