81134840842 has 32 divisors (see below), whose sum is σ = 134030635200. Its totient is φ = 36528451200.

The previous prime is 81134840819. The next prime is 81134840851. The reversal of 81134840842 is 24804843118.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12180909 + ... + 12187567.

It is an arithmetic number, because the mean of its divisors is an integer number (4188457350).

Almost surely, 2^81134840842 is an apocalyptic number.

81134840842 is a deficient number, since it is larger than the sum of its proper divisors (52895794358).

81134840842 is a wasteful number, since it uses less digits than its factorization.

81134840842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11862.

The product of its (nonzero) digits is 196608, while the sum is 43.

The spelling of 81134840842 in words is "eighty-one billion, one hundred thirty-four million, eight hundred forty thousand, eight hundred forty-two".