1205168615117 has 4 divisors (see below), whose sum is σ = 1205250854556. Its totient is φ = 1205086375680.

The previous prime is 1205168615107. The next prime is 1205168615213. The reversal of 1205168615117 is 7115168615021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 895727852041 + 309440763076 = 946429^2 + 556274^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205168615117 - 2¹² = 1205168611021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205168615107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41097734 + ... + 41127047.

It is an arithmetic number, because the mean of its divisors is an integer number (301312713639).

Almost surely, 2^{1205168615117} is an apocalyptic number.

It is an amenable number.

1205168615117 is a deficient number, since it is larger than the sum of its proper divisors (82239439).

1205168615117 is an equidigital number, since it uses as much as digits as its factorization.

1205168615117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82239438.

The product of its (nonzero) digits is 100800, while the sum is 44.

The spelling of 1205168615117 in words is "one trillion, two hundred five billion, one hundred sixty-eight million, six hundred fifteen thousand, one hundred seventeen".