866450721 has 8 divisors (see below), whose sum is σ = 1156918464. Its totient is φ = 576808400.

The previous prime is 866450707. The next prime is 866450723. The reversal of 866450721 is 127054668.

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

It is a cyclic number.

It is not a de Polignac number, because 866450721 - 2¹⁰ = 866449697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866450721.

It is not an unprimeable number, because it can be changed into a prime (866450723) 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, 203901 + ... + 208106.

It is an arithmetic number, because the mean of its divisors is an integer number (144614808).

Almost surely, 2^866450721 is an apocalyptic number.

It is an amenable number.

866450721 is a deficient number, since it is larger than the sum of its proper divisors (290467743).

866450721 is a wasteful number, since it uses less digits than its factorization.

866450721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412711.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 866450721 is about 29435.5350044806. The cubic root of 866450721 is about 953.3403081819.

The spelling of 866450721 in words is "eight hundred sixty-six million, four hundred fifty thousand, seven hundred twenty-one".