71737055381 has 2 divisors, whose sum is σ = 71737055382. Its totient is φ = 71737055380.

The previous prime is 71737055371. The next prime is 71737055393. The reversal of 71737055381 is 18355073717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62365072900 + 9371982481 = 249730^2 + 96809^2 .

It is an emirp because it is prime and its reverse (18355073717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71737055381 - 2¹⁸ = 71736793237 is a prime.

It is a super-2 number, since 2×71737055381² (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 (71737055371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35868527690 + 35868527691.

It is an arithmetic number, because the mean of its divisors is an integer number (35868527691).

Almost surely, 2^71737055381 is an apocalyptic number.

It is an amenable number.

71737055381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71737055381 is an equidigital number, since it uses as much as digits as its factorization.

71737055381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 617400, while the sum is 47.

The spelling of 71737055381 in words is "seventy-one billion, seven hundred thirty-seven million, fifty-five thousand, three hundred eighty-one".