1161261613643 has 16 divisors (see below), whose sum is σ = 1262209751040. Its totient is φ = 1064318745600.

The previous prime is 1161261613637. The next prime is 1161261613667. The reversal of 1161261613643 is 3463161621611.

It is a cyclic number.

It is not a de Polignac number, because 1161261613643 - 2²⁰ = 1161260565067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161261613643.

It is not an unprimeable number, because it can be changed into a prime (1161261613243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1570571 + ... + 2188427.

It is an arithmetic number, because the mean of its divisors is an integer number (78888109440).

Almost surely, 2^{1161261613643} is an apocalyptic number.

1161261613643 is a deficient number, since it is larger than the sum of its proper divisors (100948137397).

1161261613643 is a wasteful number, since it uses less digits than its factorization.

1161261613643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621098.

The product of its digits is 93312, while the sum is 41.

The spelling of 1161261613643 in words is "one trillion, one hundred sixty-one billion, two hundred sixty-one million, six hundred thirteen thousand, six hundred forty-three".