81249268834 has 16 divisors (see below), whose sum is σ = 122380327872. Its totient is φ = 40456147248.

The previous prime is 81249268823. The next prime is 81249268843. The reversal of 81249268834 is 43886294218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429787 + ... + 589249.

It is an arithmetic number, because the mean of its divisors is an integer number (7648770492).

Almost surely, 2^81249268834 is an apocalyptic number.

81249268834 is a deficient number, since it is larger than the sum of its proper divisors (41131059038).

81249268834 is a wasteful number, since it uses less digits than its factorization.

81249268834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160521.

The product of its digits is 5308416, while the sum is 55.

The spelling of 81249268834 in words is "eighty-one billion, two hundred forty-nine million, two hundred sixty-eight thousand, eight hundred thirty-four".