165510601065993 has 4 divisors (see below), whose sum is σ = 220680801421328. Its totient is φ = 110340400710660.

The previous prime is 165510601065961. The next prime is 165510601066049. The reversal of 165510601065993 is 399560106015561.

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.

It is not a de Polignac number, because 165510601065993 - 2⁵ = 165510601065961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165510601069993) 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, 27585100177663 + ... + 27585100177668.

It is an arithmetic number, because the mean of its divisors is an integer number (55170200355332).

Almost surely, 2^{165510601065993} is an apocalyptic number.

It is an amenable number.

165510601065993 is a deficient number, since it is larger than the sum of its proper divisors (55170200355335).

165510601065993 is an equidigital number, since it uses as much as digits as its factorization.

165510601065993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55170200355334.

The product of its (nonzero) digits is 6561000, while the sum is 57.

The spelling of 165510601065993 in words is "one hundred sixty-five trillion, five hundred ten billion, six hundred one million, sixty-five thousand, nine hundred ninety-three".