1165551111645 has 8 divisors (see below), whose sum is σ = 1864881778656. Its totient is φ = 621627259536.

The previous prime is 1165551111643. The next prime is 1165551111713. The reversal of 1165551111645 is 5461111555611.

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

It is not a de Polignac number, because 1165551111645 - 2¹ = 1165551111643 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1165551111597 and 1165551111606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165551111643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38851703707 + ... + 38851703736.

It is an arithmetic number, because the mean of its divisors is an integer number (233110222332).

Almost surely, 2^{1165551111645} is an apocalyptic number.

1165551111645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165551111645 is a deficient number, since it is larger than the sum of its proper divisors (699330667011).

1165551111645 is an equidigital number, since it uses as much as digits as its factorization.

1165551111645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77703407451.

The product of its digits is 90000, while the sum is 42.

The spelling of 1165551111645 in words is "one trillion, one hundred sixty-five billion, five hundred fifty-one million, one hundred eleven thousand, six hundred forty-five".