9999872745869 has 2 divisors, whose sum is σ = 9999872745870. Its totient is φ = 9999872745868.

The previous prime is 9999872745847. The next prime is 9999872745887. The reversal of 9999872745869 is 9685472789999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9972237673225 + 27635072644 = 3157885^2 + 166238^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999872745869 - 2⁸ = 9999872745613 is a prime.

It is a super-2 number, since 2×9999872745869² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999872745829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999936372934 + 4999936372935.

It is an arithmetic number, because the mean of its divisors is an integer number (4999936372935).

Almost surely, 2^{9999872745869} is an apocalyptic number.

It is an amenable number.

9999872745869 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999872745869 is an equidigital number, since it uses as much as digits as its factorization.

9999872745869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44442639360, while the sum is 92.

The spelling of 9999872745869 in words is "nine trillion, nine hundred ninety-nine billion, eight hundred seventy-two million, seven hundred forty-five thousand, eight hundred sixty-nine".