818864641 has 8 divisors (see below), whose sum is σ = 985100480. Its totient is φ = 664942608.

The previous prime is 818864639. The next prime is 818864693. The reversal of 818864641 is 146468818.

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 818864641 - 2¹ = 818864639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 818864591 and 818864600.

It is not an unprimeable number, because it can be changed into a prime (818864611) 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, 3078306 + ... + 3078571.

It is an arithmetic number, because the mean of its divisors is an integer number (123137560).

Almost surely, 2^818864641 is an apocalyptic number.

It is an amenable number.

818864641 is a deficient number, since it is larger than the sum of its proper divisors (166235839).

818864641 is a wasteful number, since it uses less digits than its factorization.

818864641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156903.

The product of its digits is 294912, while the sum is 46.

The square root of 818864641 is about 28615.8110316657. The cubic root of 818864641 is about 935.5579770738.

The spelling of 818864641 in words is "eight hundred eighteen million, eight hundred sixty-four thousand, six hundred forty-one".