72180413537 has 2 divisors, whose sum is σ = 72180413538. Its totient is φ = 72180413536.

The previous prime is 72180413497. The next prime is 72180413579. The reversal of 72180413537 is 73531408127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40594593361 + 31585820176 = 201481^2 + 177724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72180413537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72180413494 and 72180413503.

It is not a weakly prime, because it can be changed into another prime (72180418537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36090206768 + 36090206769.

It is an arithmetic number, because the mean of its divisors is an integer number (36090206769).

Almost surely, 2^72180413537 is an apocalyptic number.

It is an amenable number.

72180413537 is a deficient number, since it is larger than the sum of its proper divisors (1).

72180413537 is an equidigital number, since it uses as much as digits as its factorization.

72180413537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 72180413537 in words is "seventy-two billion, one hundred eighty million, four hundred thirteen thousand, five hundred thirty-seven".