81914980539 has 64 divisors (see below), whose sum is σ = 138356619264. Its totient is φ = 42003726336.

The previous prime is 81914980489. The next prime is 81914980561. The reversal of 81914980539 is 93508941918.

It is not a de Polignac number, because 81914980539 - 2¹² = 81914976443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81914980639) 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 63 ways as a sum of consecutive naturals, for example, 2554107 + ... + 2585979.

It is an arithmetic number, because the mean of its divisors is an integer number (2161822176).

Almost surely, 2^81914980539 is an apocalyptic number.

81914980539 is a deficient number, since it is larger than the sum of its proper divisors (56441638725).

81914980539 is a wasteful number, since it uses less digits than its factorization.

81914980539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32236.

The product of its (nonzero) digits is 2799360, while the sum is 57.

The spelling of 81914980539 in words is "eighty-one billion, nine hundred fourteen million, nine hundred eighty thousand, five hundred thirty-nine".