81988712002 has 8 divisors (see below), whose sum is σ = 122998880700. Its totient is φ = 40989085104.

The previous prime is 81988711967. The next prime is 81988712009. The reversal of 81988712002 is 20021788918.

It can be written as a sum of positive squares in 2 ways, for example, as 76829306761 + 5159405241 = 277181^2 + 71829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81988712009) 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 3 ways as a sum of consecutive naturals, for example, 2615977 + ... + 2647132.

Almost surely, 2^81988712002 is an apocalyptic number.

81988712002 is a deficient number, since it is larger than the sum of its proper divisors (41010168698).

81988712002 is a wasteful number, since it uses less digits than its factorization.

81988712002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270900.

The product of its (nonzero) digits is 129024, while the sum is 46.

The spelling of 81988712002 in words is "eighty-one billion, nine hundred eighty-eight million, seven hundred twelve thousand, two".