72681456212 has 6 divisors (see below), whose sum is σ = 127192548378. Its totient is φ = 36340728104.

The previous prime is 72681456191. The next prime is 72681456217. The reversal of 72681456212 is 21265418627.

It can be written as a sum of positive squares in only one way, i.e., 67000216336 + 5681239876 = 258844^2 + 75374^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72681456217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085182023 + ... + 9085182030.

It is an arithmetic number, because the mean of its divisors is an integer number (21198758063).

Almost surely, 2^72681456212 is an apocalyptic number.

It is an amenable number.

72681456212 is a deficient number, since it is larger than the sum of its proper divisors (54511092166).

72681456212 is a wasteful number, since it uses less digits than its factorization.

72681456212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18170364057 (or 18170364055 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The spelling of 72681456212 in words is "seventy-two billion, six hundred eighty-one million, four hundred fifty-six thousand, two hundred twelve".