866481621 has 8 divisors (see below), whose sum is σ = 1161115200. Its totient is φ = 574751232.

The previous prime is 866481569. The next prime is 866481667. The reversal of 866481621 is 126184668.

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

It is not a de Polignac number, because 866481621 - 2¹¹ = 866479573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866481521) 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, 725100 + ... + 726293.

It is an arithmetic number, because the mean of its divisors is an integer number (145139400).

Almost surely, 2^866481621 is an apocalyptic number.

It is an amenable number.

866481621 is a deficient number, since it is larger than the sum of its proper divisors (294633579).

866481621 is a wasteful number, since it uses less digits than its factorization.

866481621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451595.

The product of its digits is 110592, while the sum is 42.

The square root of 866481621 is about 29436.0598756016. The cubic root of 866481621 is about 953.3516409539.

The spelling of 866481621 in words is "eight hundred sixty-six million, four hundred eighty-one thousand, six hundred twenty-one".