72547144781 has 2 divisors, whose sum is σ = 72547144782. Its totient is φ = 72547144780.

The previous prime is 72547144739. The next prime is 72547144867. The reversal of 72547144781 is 18744174527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60511080100 + 12036064681 = 245990^2 + 109709^2 .

It is a cyclic number.

It is not a de Polignac number, because 72547144781 - 2¹⁸ = 72546882637 is a prime.

It is a super-2 number, since 2×72547144781² (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 (72547144721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36273572390 + 36273572391.

It is an arithmetic number, because the mean of its divisors is an integer number (36273572391).

Almost surely, 2^72547144781 is an apocalyptic number.

It is an amenable number.

72547144781 is a deficient number, since it is larger than the sum of its proper divisors (1).

72547144781 is an equidigital number, since it uses as much as digits as its factorization.

72547144781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1756160, while the sum is 50.

The spelling of 72547144781 in words is "seventy-two billion, five hundred forty-seven million, one hundred forty-four thousand, seven hundred eighty-one".