1261163872105 has 8 divisors (see below), whose sum is σ = 1521001656000. Its totient is φ = 1003861091376.

The previous prime is 1261163872097. The next prime is 1261163872117. The reversal of 1261163872105 is 5012783611621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261163872105 - 2³ = 1261163872097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633749695 + ... + 633751684.

It is an arithmetic number, because the mean of its divisors is an integer number (190125207000).

Almost surely, 2^{1261163872105} is an apocalyptic number.

It is an amenable number.

1261163872105 is a deficient number, since it is larger than the sum of its proper divisors (259837783895).

1261163872105 is a wasteful number, since it uses less digits than its factorization.

1261163872105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267501583.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 1261163872105 in words is "one trillion, two hundred sixty-one billion, one hundred sixty-three million, eight hundred seventy-two thousand, one hundred five".