81812211514 has 16 divisors (see below), whose sum is σ = 134260346016. Its totient is φ = 37080197200.

The previous prime is 81812211347. The next prime is 81812211521. The reversal of 81812211514 is 41511221818.

It is a super-2 number, since 2×81812211514² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81812211514.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5350777 + ... + 5366044.

It is an arithmetic number, because the mean of its divisors is an integer number (8391271626).

Almost surely, 2^81812211514 is an apocalyptic number.

81812211514 is a deficient number, since it is larger than the sum of its proper divisors (52448134502).

81812211514 is a wasteful number, since it uses less digits than its factorization.

81812211514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717181.

The product of its digits is 5120, while the sum is 34.

The spelling of 81812211514 in words is "eighty-one billion, eight hundred twelve million, two hundred eleven thousand, five hundred fourteen".