165646156553243 has 4 divisors (see below), whose sum is σ = 165659797853088. Its totient is φ = 165632515253400.

The previous prime is 165646156553179. The next prime is 165646156553291. The reversal of 165646156553243 is 342355651646561.

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

It is a cyclic number.

It is not a de Polignac number, because 165646156553243 - 2⁶ = 165646156553179 is a prime.

It is a super-3 number, since 3×165646156553243³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165646156559243) 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, 6820631708 + ... + 6820655993.

It is an arithmetic number, because the mean of its divisors is an integer number (41414949463272).

Almost surely, 2^{165646156553243} is an apocalyptic number.

165646156553243 is a deficient number, since it is larger than the sum of its proper divisors (13641299845).

165646156553243 is a wasteful number, since it uses less digits than its factorization.

165646156553243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13641299844.

The product of its digits is 233280000, while the sum is 62.

The spelling of 165646156553243 in words is "one hundred sixty-five trillion, six hundred forty-six billion, one hundred fifty-six million, five hundred fifty-three thousand, two hundred forty-three".