1361260405105 has 4 divisors (see below), whose sum is σ = 1633512486132. Its totient is φ = 1089008324080.

The previous prime is 1361260405081. The next prime is 1361260405117. The reversal of 1361260405105 is 5015040621631.

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 959598527281 + 401661877824 = 979591^2 + 633768^2 .

It is not a de Polignac number, because 1361260405105 - 2⁵ = 1361260405073 is a prime.

It is a super-2 number, since 2×1361260405105² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136126040506 + ... + 136126040515.

It is an arithmetic number, because the mean of its divisors is an integer number (408378121533).

Almost surely, 2^{1361260405105} is an apocalyptic number.

It is an amenable number.

1361260405105 is a deficient number, since it is larger than the sum of its proper divisors (272252081027).

1361260405105 is an equidigital number, since it uses as much as digits as its factorization.

1361260405105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272252081026.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 1361260405105 in words is "one trillion, three hundred sixty-one billion, two hundred sixty million, four hundred five thousand, one hundred five".