72530771381 has 2 divisors, whose sum is σ = 72530771382. Its totient is φ = 72530771380.

The previous prime is 72530771359. The next prime is 72530771387. The reversal of 72530771381 is 18317703527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53932630756 + 18598140625 = 232234^2 + 136375^2 .

It is a cyclic number.

It is not a de Polignac number, because 72530771381 - 2²⁶ = 72463662517 is a prime.

It is a super-2 number, since 2×72530771381² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72530771387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36265385690 + 36265385691.

It is an arithmetic number, because the mean of its divisors is an integer number (36265385691).

Almost surely, 2^72530771381 is an apocalyptic number.

It is an amenable number.

72530771381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72530771381 is an equidigital number, since it uses as much as digits as its factorization.

72530771381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 72530771381 in words is "seventy-two billion, five hundred thirty million, seven hundred seventy-one thousand, three hundred eighty-one".