9661385597 has 2 divisors, whose sum is σ = 9661385598. Its totient is φ = 9661385596.

The previous prime is 9661385593. The next prime is 9661385599. The reversal of 9661385597 is 7955831669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8466024121 + 1195361476 = 92011^2 + 34574^2 .

It is a cyclic number.

It is not a de Polignac number, because 9661385597 - 2² = 9661385593 is a prime.

Together with 9661385599, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661385593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830692798 + 4830692799.

It is an arithmetic number, because the mean of its divisors is an integer number (4830692799).

Almost surely, 2^9661385597 is an apocalyptic number.

It is an amenable number.

9661385597 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661385597 is an equidigital number, since it uses as much as digits as its factorization.

9661385597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12247200, while the sum is 59.

The square root of 9661385597 is about 98292.3476014283. The cubic root of 9661385597 is about 2129.8375122730.

The spelling of 9661385597 in words is "nine billion, six hundred sixty-one million, three hundred eighty-five thousand, five hundred ninety-seven".