81351643002 has 32 divisors (see below), whose sum is σ = 186780475392. Its totient is φ = 23139093744.

The previous prime is 81351642997. The next prime is 81351643063. The reversal of 81351643002 is 20034615318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4333558 + ... + 4352289.

It is an arithmetic number, because the mean of its divisors is an integer number (5836889856).

Almost surely, 2^81351643002 is an apocalyptic number.

81351643002 is an abundant number, since it is smaller than the sum of its proper divisors (105428832390).

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

81351643002 is a wasteful number, since it uses less digits than its factorization.

81351643002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8686082.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 81351643002 in words is "eighty-one billion, three hundred fifty-one million, six hundred forty-three thousand, two".