165243604440533 has 4 divisors (see below), whose sum is σ = 165268944671628. Its totient is φ = 165218264209440.

The previous prime is 165243604440517. The next prime is 165243604440547. The reversal of 165243604440533 is 335044406342561.

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 112475845444369 + 52767758996164 = 10605463^2 + 7264142^2 .

It is a cyclic number.

It is not a de Polignac number, because 165243604440533 - 2⁴ = 165243604440517 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 (165243604442533) 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, 12670105766 + ... + 12670118807.

It is an arithmetic number, because the mean of its divisors is an integer number (41317236167907).

Almost surely, 2^{165243604440533} is an apocalyptic number.

It is an amenable number.

165243604440533 is a deficient number, since it is larger than the sum of its proper divisors (25340231095).

165243604440533 is an equidigital number, since it uses as much as digits as its factorization.

165243604440533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25340231094.

The product of its (nonzero) digits is 12441600, while the sum is 50.

The spelling of 165243604440533 in words is "one hundred sixty-five trillion, two hundred forty-three billion, six hundred four million, four hundred forty thousand, five hundred thirty-three".