999896879161 has 2 divisors, whose sum is σ = 999896879162. Its totient is φ = 999896879160.

The previous prime is 999896879077. The next prime is 999896879243. The reversal of 999896879161 is 161978698999.

It is a happy number.

It is an a-pointer prime, because the next prime (999896879243) can be obtained adding 999896879161 to its sum of digits (82).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632502090000 + 367394789161 = 795300^2 + 606131^2 .

It is a cyclic number.

It is not a de Polignac number, because 999896879161 - 2²³ = 999888490553 is a prime.

It is not a weakly prime, because it can be changed into another prime (999806879161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499948439580 + 499948439581.

It is an arithmetic number, because the mean of its divisors is an integer number (499948439581).

Almost surely, 2^999896879161 is an apocalyptic number.

999896879161 is the 577321-st hex number.

It is an amenable number.

999896879161 is a deficient number, since it is larger than the sum of its proper divisors (1).

999896879161 is an equidigital number, since it uses as much as digits as its factorization.

999896879161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952342272, while the sum is 82.

The spelling of 999896879161 in words is "nine hundred ninety-nine billion, eight hundred ninety-six million, eight hundred seventy-nine thousand, one hundred sixty-one".