81212227614 has 192 divisors, whose sum is σ = 218687938560. Its totient is φ = 22084967520.

The previous prime is 81212227601. The next prime is 81212227631. The reversal of 81212227614 is 41672221218.

81212227614 is a `hidden beast` number, since 8 + 1 + 2 + 12 + 2 + 27 + 614 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16507447 + ... + 16512365.

It is an arithmetic number, because the mean of its divisors is an integer number (1138999680).

Almost surely, 2^81212227614 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81212227614, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109343969280).

81212227614 is an abundant number, since it is smaller than the sum of its proper divisors (137475710946).

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

81212227614 is a wasteful number, since it uses less digits than its factorization.

81212227614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177 (or 5165 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The spelling of 81212227614 in words is "eighty-one billion, two hundred twelve million, two hundred twenty-seven thousand, six hundred fourteen".