9951558797 has 2 divisors, whose sum is σ = 9951558798. Its totient is φ = 9951558796.

The previous prime is 9951558791. The next prime is 9951558811. The reversal of 9951558797 is 7978551599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9523027396 + 428531401 = 97586^2 + 20701^2 .

It is a cyclic number.

It is not a de Polignac number, because 9951558797 - 2⁴ = 9951558781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9951558791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4975779398 + 4975779399.

It is an arithmetic number, because the mean of its divisors is an integer number (4975779399).

Almost surely, 2^9951558797 is an apocalyptic number.

It is an amenable number.

9951558797 is a deficient number, since it is larger than the sum of its proper divisors (1).

9951558797 is an equidigital number, since it uses as much as digits as its factorization.

9951558797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35721000, while the sum is 65.

The square root of 9951558797 is about 99757.4999536376. The cubic root of 9951558797 is about 2150.9502773836.

The spelling of 9951558797 in words is "nine billion, nine hundred fifty-one million, five hundred fifty-eight thousand, seven hundred ninety-seven".