81226822249408 has 84 divisors (see below), whose sum is σ = 183279013573320. Its totient is φ = 35648135057920.

The previous prime is 81226822249351. The next prime is 81226822249411. The reversal of 81226822249408 is 80494222862218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180620266 + ... + 181069417.

It is an arithmetic number, because the mean of its divisors is an integer number (2181893018730).

Almost surely, 2^{81226822249408} is an apocalyptic number.

81226822249408 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81226822249408 is an abundant number, since it is smaller than the sum of its proper divisors (102052191323912).

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

81226822249408 is a wasteful number, since it uses less digits than its factorization.

81226822249408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361689746 (or 361689725 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 58.

The spelling of 81226822249408 in words is "eighty-one trillion, two hundred twenty-six billion, eight hundred twenty-two million, two hundred forty-nine thousand, four hundred eight".