72665721248 has 12 divisors (see below), whose sum is σ = 143060638770. Its totient is φ = 36332860608.

The previous prime is 72665721169. The next prime is 72665721277. The reversal of 72665721248 is 84212756627.

It can be written as a sum of positive squares in only one way, i.e., 59327319184 + 13338402064 = 243572^2 + 115492^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72665721196 and 72665721205.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1135401863 + ... + 1135401926.

Almost surely, 2^72665721248 is an apocalyptic number.

It is an amenable number.

72665721248 is a deficient number, since it is larger than the sum of its proper divisors (70394917522).

72665721248 is a wasteful number, since it uses less digits than its factorization.

72665721248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270803799 (or 2270803791 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 50.

The spelling of 72665721248 in words is "seventy-two billion, six hundred sixty-five million, seven hundred twenty-one thousand, two hundred forty-eight".