81015751838 has 32 divisors (see below), whose sum is σ = 139277698560. Its totient is φ = 34622753760.

The previous prime is 81015751801. The next prime is 81015751853. The reversal of 81015751838 is 83815751018.

It is a junction number, because it is equal to n+sod(n) for n = 81015751792 and 81015751801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12769295 + ... + 12775637.

It is an arithmetic number, because the mean of its divisors is an integer number (4352428080).

Almost surely, 2^81015751838 is an apocalyptic number.

81015751838 is a deficient number, since it is larger than the sum of its proper divisors (58261946722).

81015751838 is a wasteful number, since it uses less digits than its factorization.

81015751838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8792.

The product of its (nonzero) digits is 268800, while the sum is 47.

The spelling of 81015751838 in words is "eighty-one billion, fifteen million, seven hundred fifty-one thousand, eight hundred thirty-eight".