81268886218 has 8 divisors (see below), whose sum is σ = 131280508548. Its totient is φ = 37508716704.

The previous prime is 81268886161. The next prime is 81268886221.

81268886218 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 75522184969 + 5746701249 = 274813^2 + 75807^2 .

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

It is a super-2 number, since 2×81268886218² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1562863171 + ... + 1562863222.

Almost surely, 2^81268886218 is an apocalyptic number.

81268886218 is a deficient number, since it is larger than the sum of its proper divisors (50011622330).

81268886218 is a wasteful number, since it uses less digits than its factorization.

81268886218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125726408.

The product of its digits is 4718592, while the sum is 58.

The spelling of 81268886218 in words is "eighty-one billion, two hundred sixty-eight million, eight hundred eighty-six thousand, two hundred eighteen".