81116439338 has 32 divisors (see below), whose sum is σ = 134535278592. Its totient is φ = 36374036400.

The previous prime is 81116439337. The next prime is 81116439343. The reversal of 81116439338 is 83393461118.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81116439292 and 81116439301.

It is not an unprimeable number, because it can be changed into a prime (81116439337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527903 + ... + 664013.

It is an arithmetic number, because the mean of its divisors is an integer number (4204227456).

Almost surely, 2^81116439338 is an apocalyptic number.

81116439338 is a deficient number, since it is larger than the sum of its proper divisors (53418839254).

81116439338 is a wasteful number, since it uses less digits than its factorization.

81116439338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136490.

The product of its digits is 373248, while the sum is 47.

The spelling of 81116439338 in words is "eighty-one billion, one hundred sixteen million, four hundred thirty-nine thousand, three hundred thirty-eight".