71181118361 has 2 divisors, whose sum is σ = 71181118362. Its totient is φ = 71181118360.

The previous prime is 71181118343. The next prime is 71181118381. The reversal of 71181118361 is 16381118117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61898952025 + 9282166336 = 248795^2 + 96344^2 .

It is a cyclic number.

It is not a de Polignac number, because 71181118361 - 2⁶ = 71181118297 is a prime.

It is a super-2 number, since 2×71181118361² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71181118381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35590559180 + 35590559181.

It is an arithmetic number, because the mean of its divisors is an integer number (35590559181).

Almost surely, 2^71181118361 is an apocalyptic number.

It is an amenable number.

71181118361 is a deficient number, since it is larger than the sum of its proper divisors (1).

71181118361 is an equidigital number, since it uses as much as digits as its factorization.

71181118361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 38.

The spelling of 71181118361 in words is "seventy-one billion, one hundred eighty-one million, one hundred eighteen thousand, three hundred sixty-one".