72578735911181 has 2 divisors, whose sum is σ = 72578735911182. Its totient is φ = 72578735911180.

The previous prime is 72578735911159. The next prime is 72578735911211. The reversal of 72578735911181 is 18111953787527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36309554599081 + 36269181312100 = 6025741^2 + 6022390^2 .

It is a cyclic number.

It is not a de Polignac number, because 72578735911181 - 2⁶ = 72578735911117 is a prime.

It is a super-2 number, since 2×72578735911181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72578735911081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36289367955590 + 36289367955591.

It is an arithmetic number, because the mean of its divisors is an integer number (36289367955591).

Almost surely, 2^{72578735911181} is an apocalyptic number.

It is an amenable number.

72578735911181 is a deficient number, since it is larger than the sum of its proper divisors (1).

72578735911181 is an equidigital number, since it uses as much as digits as its factorization.

72578735911181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29635200, while the sum is 65.

The spelling of 72578735911181 in words is "seventy-two trillion, five hundred seventy-eight billion, seven hundred thirty-five million, nine hundred eleven thousand, one hundred eighty-one".