81433674608 has 160 divisors (see below), whose sum is σ = 187667988480. Its totient is φ = 33745582080.

The previous prime is 81433674577. The next prime is 81433674613. The reversal of 81433674608 is 80647633418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74915441 + ... + 74916527.

It is an arithmetic number, because the mean of its divisors is an integer number (1172924928).

Almost surely, 2^81433674608 is an apocalyptic number.

81433674608 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81433674608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93833994240).

81433674608 is an abundant number, since it is smaller than the sum of its proper divisors (106234313872).

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

81433674608 is a wasteful number, since it uses less digits than its factorization.

81433674608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495 (or 1489 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 81433674608 in words is "eighty-one billion, four hundred thirty-three million, six hundred seventy-four thousand, six hundred eight".