81344380626 has 32 divisors (see below), whose sum is σ = 184969139520. Its totient is φ = 26484216192.

The previous prime is 81344380573. The next prime is 81344380627. The reversal of 81344380626 is 62608344318.

81344380626 is a `hidden beast` number, since 8 + 13 + 4 + 4 + 3 + 8 + 0 + 626 = 666.

It is not an unprimeable number, because it can be changed into a prime (81344380627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17513695 + ... + 17518338.

It is an arithmetic number, because the mean of its divisors is an integer number (5780285610).

Almost surely, 2^81344380626 is an apocalyptic number.

81344380626 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81344380626 is an abundant number, since it is smaller than the sum of its proper divisors (103624758894).

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

81344380626 is a wasteful number, since it uses less digits than its factorization.

81344380626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35032087 (or 35032081 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 81344380626 in words is "eighty-one billion, three hundred forty-four million, three hundred eighty thousand, six hundred twenty-six".