81152731288 has 16 divisors (see below), whose sum is σ = 152186876280. Its totient is φ = 40569564288.

The previous prime is 81152731267. The next prime is 81152731291. The reversal of 81152731288 is 88213725118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799281 + ... + 895072.

Almost surely, 2^81152731288 is an apocalyptic number.

It is an amenable number.

81152731288 is a deficient number, since it is larger than the sum of its proper divisors (71034144992).

81152731288 is a wasteful number, since it uses less digits than its factorization.

81152731288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700346 (or 1700342 counting only the distinct ones).

The product of its digits is 215040, while the sum is 46.

The spelling of 81152731288 in words is "eighty-one billion, one hundred fifty-two million, seven hundred thirty-one thousand, two hundred eighty-eight".