81872076112 has 10 divisors (see below), whose sum is σ = 158627147498. Its totient is φ = 40936038048.

The previous prime is 81872076089. The next prime is 81872076119. The reversal of 81872076112 is 21167027818.

It can be written as a sum of positive squares in only one way, i.e., 79781391936 + 2090684176 = 282456^2 + 45724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81872076119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2558502363 + ... + 2558502394.

Almost surely, 2^81872076112 is an apocalyptic number.

It is an amenable number.

81872076112 is a deficient number, since it is larger than the sum of its proper divisors (76755071386).

81872076112 is a wasteful number, since it uses less digits than its factorization.

81872076112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117004765 (or 5117004759 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 81872076112 in words is "eighty-one billion, eight hundred seventy-two million, seventy-six thousand, one hundred twelve".