81457831334 has 32 divisors (see below), whose sum is σ = 136731611520. Its totient is φ = 36074030400.

The previous prime is 81457831307. The next prime is 81457831391. The reversal of 81457831334 is 43313875418.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 605477 + ... + 727679.

It is an arithmetic number, because the mean of its divisors is an integer number (4272862860).

Almost surely, 2^81457831334 is an apocalyptic number.

81457831334 is a deficient number, since it is larger than the sum of its proper divisors (55273780186).

81457831334 is a wasteful number, since it uses less digits than its factorization.

81457831334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122996.

The product of its digits is 967680, while the sum is 47.

The spelling of 81457831334 in words is "eighty-one billion, four hundred fifty-seven million, eight hundred thirty-one thousand, three hundred thirty-four".