818229393651 has 64 divisors (see below), whose sum is σ = 1221673812480. Its totient is φ = 484091873280.

The previous prime is 818229393643. The next prime is 818229393671. The reversal of 818229393651 is 156393922818.

It is a happy number.

It is not a de Polignac number, because 818229393651 - 2³ = 818229393643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 818229393591 and 818229393600.

It is not an unprimeable number, because it can be changed into a prime (818229393671) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 203487021 + ... + 203491041.

It is an arithmetic number, because the mean of its divisors is an integer number (19088653320).

Almost surely, 2^818229393651 is an apocalyptic number.

818229393651 is a deficient number, since it is larger than the sum of its proper divisors (403444418829).

818229393651 is a wasteful number, since it uses less digits than its factorization.

818229393651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4996.

The product of its digits is 5598720, while the sum is 57.

The spelling of 818229393651 in words is "eight hundred eighteen billion, two hundred twenty-nine million, three hundred ninety-three thousand, six hundred fifty-one".