9661356437 has 2 divisors, whose sum is σ = 9661356438. Its totient is φ = 9661356436.

The previous prime is 9661356413. The next prime is 9661356451. The reversal of 9661356437 is 7346531669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5801716561 + 3859639876 = 76169^2 + 62126^2 .

It is an emirp because it is prime and its reverse (7346531669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9661356437 - 2¹² = 9661352341 is a prime.

It is a super-2 number, since 2×9661356437² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661356407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830678218 + 4830678219.

It is an arithmetic number, because the mean of its divisors is an integer number (4830678219).

Almost surely, 2^9661356437 is an apocalyptic number.

It is an amenable number.

9661356437 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661356437 is an equidigital number, since it uses as much as digits as its factorization.

9661356437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 50.

The square root of 9661356437 is about 98292.1992683041. The cubic root of 9661356437 is about 2129.8353695119.

The spelling of 9661356437 in words is "nine billion, six hundred sixty-one million, three hundred fifty-six thousand, four hundred thirty-seven".