71611365481 has 2 divisors, whose sum is σ = 71611365482. Its totient is φ = 71611365480.

The previous prime is 71611365473. The next prime is 71611365487. The reversal of 71611365481 is 18456311617.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71297544256 + 313821225 = 267016^2 + 17715^2 .

It is a cyclic number.

It is not a de Polignac number, because 71611365481 - 2³ = 71611365473 is a prime.

It is a super-2 number, since 2×71611365481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71611365487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35805682740 + 35805682741.

It is an arithmetic number, because the mean of its divisors is an integer number (35805682741).

Almost surely, 2^71611365481 is an apocalyptic number.

It is an amenable number.

71611365481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71611365481 is an equidigital number, since it uses as much as digits as its factorization.

71611365481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

It can be divided in two parts, 7161136 and 5481, that added together give a palindrome (7166617).

The spelling of 71611365481 in words is "seventy-one billion, six hundred eleven million, three hundred sixty-five thousand, four hundred eighty-one".