72540344215061 has 2 divisors, whose sum is σ = 72540344215062. Its totient is φ = 72540344215060.

The previous prime is 72540344215033. The next prime is 72540344215067. The reversal of 72540344215061 is 16051244304527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72446398287025 + 93945928036 = 8511545^2 + 306506^2 .

It is a cyclic number.

It is not a de Polignac number, because 72540344215061 - 2¹⁸ = 72540343952917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72540344215067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36270172107530 + 36270172107531.

It is an arithmetic number, because the mean of its divisors is an integer number (36270172107531).

Almost surely, 2^{72540344215061} is an apocalyptic number.

It is an amenable number.

72540344215061 is a deficient number, since it is larger than the sum of its proper divisors (1).

72540344215061 is an equidigital number, since it uses as much as digits as its factorization.

72540344215061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 44.

Adding to 72540344215061 its reverse (16051244304527), we get a palindrome (88591588519588).

The spelling of 72540344215061 in words is "seventy-two trillion, five hundred forty billion, three hundred forty-four million, two hundred fifteen thousand, sixty-one".