99999796409 has 2 divisors, whose sum is σ = 99999796410. Its totient is φ = 99999796408.

The previous prime is 99999796399. The next prime is 99999796441. The reversal of 99999796409 is 90469799999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89880040000 + 10119756409 = 299800^2 + 100597^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999796409 - 2⁸ = 99999796153 is a prime.

It is a super-3 number, since 3×99999796409³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (99999795409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999898204 + 49999898205.

It is an arithmetic number, because the mean of its divisors is an integer number (49999898205).

Almost surely, 2^99999796409 is an apocalyptic number.

It is an amenable number.

99999796409 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999796409 is an equidigital number, since it uses as much as digits as its factorization.

99999796409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 803538792, while the sum is 80.

The spelling of 99999796409 in words is "ninety-nine billion, nine hundred ninety-nine million, seven hundred ninety-six thousand, four hundred nine".