81342458938 has 16 divisors (see below), whose sum is σ = 132236301960. Its totient is φ = 37303546176.

The previous prime is 81342458929. The next prime is 81342459017. The reversal of 81342458938 is 83985424318.

It can be written as a sum of positive squares in 4 ways, for example, as 70088856049 + 11253602889 = 264743^2 + 106083^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9959473 + ... + 9967636.

Almost surely, 2^81342458938 is an apocalyptic number.

81342458938 is a deficient number, since it is larger than the sum of its proper divisors (50893843022).

81342458938 is a wasteful number, since it uses less digits than its factorization.

81342458938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19927281.

The product of its digits is 6635520, while the sum is 55.

It can be divided in two parts, 81342 and 458938, that added together give a triangular number (540280 = T₁₀₃₉).

The spelling of 81342458938 in words is "eighty-one billion, three hundred forty-two million, four hundred fifty-eight thousand, nine hundred thirty-eight".