81457341836 has 12 divisors (see below), whose sum is σ = 153515759712. Its totient is φ = 37595696208.

The previous prime is 81457341809. The next prime is 81457341881. The reversal of 81457341836 is 63814375418.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783243620 + ... + 783243723.

It is an arithmetic number, because the mean of its divisors is an integer number (12792979976).

Almost surely, 2^81457341836 is an apocalyptic number.

It is an amenable number.

81457341836 is a deficient number, since it is larger than the sum of its proper divisors (72058417876).

81457341836 is a wasteful number, since it uses less digits than its factorization.

81457341836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566487360 (or 1566487358 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 50.

The spelling of 81457341836 in words is "eighty-one billion, four hundred fifty-seven million, three hundred forty-one thousand, eight hundred thirty-six".