81434680073434 has 32 divisors (see below), whose sum is σ = 126730610487936. Its totient is φ = 39213909449280.

The previous prime is 81434680073401. The next prime is 81434680073443. The reversal of 81434680073434 is 43437008643418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13823569 + ... + 18813835.

It is an arithmetic number, because the mean of its divisors is an integer number (3960331577748).

Almost surely, 2^{81434680073434} is an apocalyptic number.

81434680073434 is a deficient number, since it is larger than the sum of its proper divisors (45295930414502).

81434680073434 is a wasteful number, since it uses less digits than its factorization.

81434680073434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992550.

The product of its (nonzero) digits is 18579456, while the sum is 55.

The spelling of 81434680073434 in words is "eighty-one trillion, four hundred thirty-four billion, six hundred eighty million, seventy-three thousand, four hundred thirty-four".