9957537881 has 2 divisors, whose sum is σ = 9957537882. Its totient is φ = 9957537880.

The previous prime is 9957537871. The next prime is 9957537883. The reversal of 9957537881 is 1887357599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9952057600 + 5480281 = 99760^2 + 2341^2 .

It is an emirp because it is prime and its reverse (1887357599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9957537881 - 2¹⁰ = 9957536857 is a prime.

It is a super-2 number, since 2×9957537881² (a number of 21 digits) contains 22 as substring.

Together with 9957537883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9957537883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4978768940 + 4978768941.

It is an arithmetic number, because the mean of its divisors is an integer number (4978768941).

Almost surely, 2^9957537881 is an apocalyptic number.

It is an amenable number.

9957537881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9957537881 is an equidigital number, since it uses as much as digits as its factorization.

9957537881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19051200, while the sum is 62.

The square root of 9957537881 is about 99787.4635462792. The cubic root of 9957537881 is about 2151.3809682887.

The spelling of 9957537881 in words is "nine billion, nine hundred fifty-seven million, five hundred thirty-seven thousand, eight hundred eighty-one".