72489337381 has 2 divisors, whose sum is σ = 72489337382. Its totient is φ = 72489337380.

The previous prime is 72489337357. The next prime is 72489337423. The reversal of 72489337381 is 18373398427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50280886756 + 22208450625 = 224234^2 + 149025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72489337381 is a prime.

It is a super-2 number, since 2×72489337381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72489337321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36244668690 + 36244668691.

It is an arithmetic number, because the mean of its divisors is an integer number (36244668691).

Almost surely, 2^72489337381 is an apocalyptic number.

It is an amenable number.

72489337381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72489337381 is an equidigital number, since it uses as much as digits as its factorization.

72489337381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 55.

The spelling of 72489337381 in words is "seventy-two billion, four hundred eighty-nine million, three hundred thirty-seven thousand, three hundred eighty-one".