81349068875 has 16 divisors (see below), whose sum is σ = 101531820000. Its totient is φ = 65074010400.

The previous prime is 81349068839. The next prime is 81349068883. The reversal of 81349068875 is 57886094318.

It is a happy number.

It is not a de Polignac number, because 81349068875 - 2¹⁶ = 81349003339 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2502476 + ... + 2534774.

It is an arithmetic number, because the mean of its divisors is an integer number (6345738750).

Almost surely, 2^81349068875 is an apocalyptic number.

81349068875 is a deficient number, since it is larger than the sum of its proper divisors (20182751125).

81349068875 is a wasteful number, since it uses less digits than its factorization.

81349068875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52463 (or 52453 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 81349068875 in words is "eighty-one billion, three hundred forty-nine million, sixty-eight thousand, eight hundred seventy-five".