1164381918661 has 4 divisors (see below), whose sum is σ = 1253949758572. Its totient is φ = 1074814078752.

The previous prime is 1164381918659. The next prime is 1164381918737. The reversal of 1164381918661 is 1668191834611.

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 194489820100 + 969892098561 = 441010^2 + 984831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1164381918661 - 2¹ = 1164381918659 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 (1164381918361) 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, 44783919936 + ... + 44783919961.

It is an arithmetic number, because the mean of its divisors is an integer number (313487439643).

Almost surely, 2^{1164381918661} is an apocalyptic number.

It is an amenable number.

1164381918661 is a deficient number, since it is larger than the sum of its proper divisors (89567839911).

1164381918661 is an equidigital number, since it uses as much as digits as its factorization.

1164381918661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89567839910.

The product of its digits is 1492992, while the sum is 55.

The spelling of 1164381918661 in words is "one trillion, one hundred sixty-four billion, three hundred eighty-one million, nine hundred eighteen thousand, six hundred sixty-one".