81136600742 has 16 divisors (see below), whose sum is σ = 122147479872. Its totient is φ = 40420925160.

The previous prime is 81136600717. The next prime is 81136600817. The reversal of 81136600742 is 24700663118.

It is a junction number, because it is equal to n+sod(n) for n = 81136600696 and 81136600705.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1066793 + ... + 1140315.

It is an arithmetic number, because the mean of its divisors is an integer number (7634217492).

Almost surely, 2^81136600742 is an apocalyptic number.

81136600742 is a deficient number, since it is larger than the sum of its proper divisors (41010879130).

81136600742 is a wasteful number, since it uses less digits than its factorization.

81136600742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75523.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 81136600742 in words is "eighty-one billion, one hundred thirty-six million, six hundred thousand, seven hundred forty-two".