9965394557 has 2 divisors, whose sum is σ = 9965394558. Its totient is φ = 9965394556.

The previous prime is 9965394553. The next prime is 9965394559. The reversal of 9965394557 is 7554935699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6969912196 + 2995482361 = 83486^2 + 54731^2 .

It is a cyclic number.

It is not a de Polignac number, because 9965394557 - 2² = 9965394553 is a prime.

Together with 9965394559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9965394557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9965394553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982697278 + 4982697279.

It is an arithmetic number, because the mean of its divisors is an integer number (4982697279).

Almost surely, 2^9965394557 is an apocalyptic number.

It is an amenable number.

9965394557 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965394557 is an equidigital number, since it uses as much as digits as its factorization.

9965394557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927000, while the sum is 62.

The square root of 9965394557 is about 99826.8228333447. The cubic root of 9965394557 is about 2151.9466455962.

The spelling of 9965394557 in words is "nine billion, nine hundred sixty-five million, three hundred ninety-four thousand, five hundred fifty-seven".