9999777151271 has 2 divisors, whose sum is σ = 9999777151272. Its totient is φ = 9999777151270.

The previous prime is 9999777151253. The next prime is 9999777151277. The reversal of 9999777151271 is 1721517779999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999777151271 - 2⁶ = 9999777151207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999777151277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999888575635 + 4999888575636.

It is an arithmetic number, because the mean of its divisors is an integer number (4999888575636).

Almost surely, 2^{9999777151271} is an apocalyptic number.

9999777151271 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999777151271 is an equidigital number, since it uses as much as digits as its factorization.

9999777151271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157529610, while the sum is 74.

The spelling of 9999777151271 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred seventy-seven million, one hundred fifty-one thousand, two hundred seventy-one".