1165443052251 has 4 divisors (see below), whose sum is σ = 1553924069672. Its totient is φ = 776962034832.

The previous prime is 1165443052223. The next prime is 1165443052321. The reversal of 1165443052251 is 1522503445611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1165443052251 - 2⁶ = 1165443052187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165443052201) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 194240508706 + ... + 194240508711.

It is an arithmetic number, because the mean of its divisors is an integer number (388481017418).

Almost surely, 2^{1165443052251} is an apocalyptic number.

1165443052251 is a deficient number, since it is larger than the sum of its proper divisors (388481017421).

1165443052251 is an equidigital number, since it uses as much as digits as its factorization.

1165443052251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388481017420.

The product of its (nonzero) digits is 144000, while the sum is 39.

Adding to 1165443052251 its reverse (1522503445611), we get a palindrome (2687946497862).

The spelling of 1165443052251 in words is "one trillion, one hundred sixty-five billion, four hundred forty-three million, fifty-two thousand, two hundred fifty-one".