1166979765561 has 8 divisors (see below), whose sum is σ = 1562767663680. Its totient is φ = 774589188912.

The previous prime is 1166979765557. The next prime is 1166979765563. The reversal of 1166979765561 is 1655679796611.

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

It is not a de Polignac number, because 1166979765561 - 2² = 1166979765557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166979765563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849329565 + ... + 849330938.

It is an arithmetic number, because the mean of its divisors is an integer number (195345957960).

Almost surely, 2^{1166979765561} is an apocalyptic number.

It is an amenable number.

1166979765561 is a deficient number, since it is larger than the sum of its proper divisors (395787898119).

1166979765561 is a wasteful number, since it uses less digits than its factorization.

1166979765561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698660735.

The product of its digits is 128595600, while the sum is 69.

The spelling of 1166979765561 in words is "one trillion, one hundred sixty-six billion, nine hundred seventy-nine million, seven hundred sixty-five thousand, five hundred sixty-one".