9618661397 has 2 divisors, whose sum is σ = 9618661398. Its totient is φ = 9618661396.

The previous prime is 9618661373. The next prime is 9618661439. The reversal of 9618661397 is 7931668169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8566242916 + 1052418481 = 92554^2 + 32441^2 .

It is a cyclic number.

It is not a de Polignac number, because 9618661397 - 2¹⁸ = 9618399253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9618661337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4809330698 + 4809330699.

It is an arithmetic number, because the mean of its divisors is an integer number (4809330699).

Almost surely, 2^9618661397 is an apocalyptic number.

It is an amenable number.

9618661397 is a deficient number, since it is larger than the sum of its proper divisors (1).

9618661397 is an equidigital number, since it uses as much as digits as its factorization.

9618661397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The square root of 9618661397 is about 98074.7745192412. The cubic root of 9618661397 is about 2126.6933784829.

The spelling of 9618661397 in words is "nine billion, six hundred eighteen million, six hundred sixty-one thousand, three hundred ninety-seven".