81222232968 has 36 divisors (see below), whose sum is σ = 219983430615. Its totient is φ = 27073271568.

The previous prime is 81222232939. The next prime is 81222232979. The reversal of 81222232968 is 86923222218.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 40611116484 + 40611116484 = 201522^2 + 201522^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=201522.

It is a super-2 number, since 2×81222232968² (a number of 23 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2401471 + ... + 2435057.

Almost surely, 2^81222232968 is an apocalyptic number.

It is an amenable number.

81222232968 is an abundant number, since it is smaller than the sum of its proper divisors (138761197647).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81222232968 is an frugal number, since it uses more digits than its factorization.

81222232968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67186 (or 33592 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 81222232968 in words is "eighty-one billion, two hundred twenty-two million, two hundred thirty-two thousand, nine hundred sixty-eight".