9156977786897 has 2 divisors, whose sum is σ = 9156977786898. Its totient is φ = 9156977786896.

The previous prime is 9156977786867. The next prime is 9156977786899. The reversal of 9156977786897 is 7986877796519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7972626605056 + 1184351181841 = 2823584^2 + 1088279^2 .

It is a cyclic number.

It is not a de Polignac number, because 9156977786897 - 2¹⁴ = 9156977770513 is a prime.

Together with 9156977786899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9156977786899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4578488893448 + 4578488893449.

It is an arithmetic number, because the mean of its divisors is an integer number (4578488893449).

Almost surely, 2^{9156977786897} is an apocalyptic number.

It is an amenable number.

9156977786897 is a deficient number, since it is larger than the sum of its proper divisors (1).

9156977786897 is an equidigital number, since it uses as much as digits as its factorization.

9156977786897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20163790080, while the sum is 89.

The spelling of 9156977786897 in words is "nine trillion, one hundred fifty-six billion, nine hundred seventy-seven million, seven hundred eighty-six thousand, eight hundred ninety-seven".