165256450133 has 4 divisors (see below), whose sum is σ = 165279644640. Its totient is φ = 165233255628.

The previous prime is 165256450111. The next prime is 165256450181. The reversal of 165256450133 is 331054652561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331054652561 = 41 ⋅8074503721.

It is a cyclic number.

It is not a de Polignac number, because 165256450133 - 2⁶ = 165256450069 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 (165256450103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11586563 + ... + 11600816.

It is an arithmetic number, because the mean of its divisors is an integer number (41319911160).

Almost surely, 2^165256450133 is an apocalyptic number.

It is an amenable number.

165256450133 is a deficient number, since it is larger than the sum of its proper divisors (23194507).

165256450133 is an equidigital number, since it uses as much as digits as its factorization.

165256450133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23194506.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 165256450133 in words is "one hundred sixty-five billion, two hundred fifty-six million, four hundred fifty thousand, one hundred thirty-three".