9618991453777 has 2 divisors, whose sum is σ = 9618991453778. Its totient is φ = 9618991453776.

The previous prime is 9618991453763. The next prime is 9618991453801. The reversal of 9618991453777 is 7773541998169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5954385705921 + 3664605747856 = 2440161^2 + 1914316^2 .

It is an emirp because it is prime and its reverse (7773541998169) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9618991453777 is a prime.

It is not a weakly prime, because it can be changed into another prime (9618991553777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4809495726888 + 4809495726889.

It is an arithmetic number, because the mean of its divisors is an integer number (4809495726889).

Almost surely, 2^{9618991453777} is an apocalyptic number.

It is an amenable number.

9618991453777 is a deficient number, since it is larger than the sum of its proper divisors (1).

9618991453777 is an equidigital number, since it uses as much as digits as its factorization.

9618991453777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720135360, while the sum is 76.

The spelling of 9618991453777 in words is "nine trillion, six hundred eighteen billion, nine hundred ninety-one million, four hundred fifty-three thousand, seven hundred seventy-seven".