15817670961109 has 2 divisors, whose sum is σ = 15817670961110. Its totient is φ = 15817670961108.

The previous prime is 15817670961091. The next prime is 15817670961121. The reversal of 15817670961109 is 90116907671851.

Together with previous prime (15817670961091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11946528140625 + 3871142820484 = 3456375^2 + 1967522^2 .

It is a cyclic number.

It is not a de Polignac number, because 15817670961109 - 2²³ = 15817662572501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15817670961149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7908835480554 + 7908835480555.

It is an arithmetic number, because the mean of its divisors is an integer number (7908835480555).

Almost surely, 2^{15817670961109} is an apocalyptic number.

It is an amenable number.

15817670961109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15817670961109 is an equidigital number, since it uses as much as digits as its factorization.

15817670961109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 61.

The spelling of 15817670961109 in words is "fifteen trillion, eight hundred seventeen billion, six hundred seventy million, nine hundred sixty-one thousand, one hundred nine".