81575230840977 has 16 divisors (see below), whose sum is σ = 115419633914880. Its totient is φ = 51137310021072.

The previous prime is 81575230840903. The next prime is 81575230840991. The reversal of 81575230840977 is 77904803257518.

It is not a de Polignac number, because 81575230840977 - 2¹⁰ = 81575230839953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81575230840277) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10019061373 + ... + 10019069514.

It is an arithmetic number, because the mean of its divisors is an integer number (7213727119680).

Almost surely, 2^{81575230840977} is an apocalyptic number.

It is an amenable number.

81575230840977 is a deficient number, since it is larger than the sum of its proper divisors (33844403073903).

81575230840977 is a wasteful number, since it uses less digits than its factorization.

81575230840977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20038130972.

The product of its (nonzero) digits is 118540800, while the sum is 66.

The spelling of 81575230840977 in words is "eighty-one trillion, five hundred seventy-five billion, two hundred thirty million, eight hundred forty thousand, nine hundred seventy-seven".