81097533375 has 32 divisors (see below), whose sum is σ = 136282461120. Its totient is φ = 42823760000.

The previous prime is 81097533371. The next prime is 81097533467. The reversal of 81097533375 is 57333579018.

It is not a de Polignac number, because 81097533375 - 2² = 81097533371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81097533371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1032720 + ... + 1108469.

It is an arithmetic number, because the mean of its divisors is an integer number (4258826910).

Almost surely, 2^81097533375 is an apocalyptic number.

81097533375 is a deficient number, since it is larger than the sum of its proper divisors (55184927745).

81097533375 is a wasteful number, since it uses less digits than its factorization.

81097533375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141308 (or 2141298 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 51.

It can be divided in two parts, 810975 and 33375, that added together give a triangular number (844350 = T₁₂₉₉).

The spelling of 81097533375 in words is "eighty-one billion, ninety-seven million, five hundred thirty-three thousand, three hundred seventy-five".