81002755075 has 12 divisors (see below), whose sum is σ = 109574636328. Its totient is φ = 58911094400.

The previous prime is 81002755051. The next prime is 81002755111. The reversal of 81002755075 is 57055720018.

It is not a de Polignac number, because 81002755075 - 2⁷ = 81002754947 is a prime.

It is a super-2 number, since 2×81002755075² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 147277462 + ... + 147278011.

It is an arithmetic number, because the mean of its divisors is an integer number (9131219694).

Almost surely, 2^81002755075 is an apocalyptic number.

81002755075 is a deficient number, since it is larger than the sum of its proper divisors (28571881253).

81002755075 is a wasteful number, since it uses less digits than its factorization.

81002755075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294555494 (or 294555489 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 40.

The spelling of 81002755075 in words is "eighty-one billion, two million, seven hundred fifty-five thousand, seventy-five".