165511106551055 has 8 divisors (see below), whose sum is σ = 198618059142144. Its totient is φ = 132405731053600.

The previous prime is 165511106551003. The next prime is 165511106551061. The reversal of 165511106551055 is 550155601115561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165511106551055 - 2¹² = 165511106546959 is a prime.

It is a super-2 number, since 2×165511106551055² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 394042511 + ... + 394462320.

It is an arithmetic number, because the mean of its divisors is an integer number (24827257392768).

Almost surely, 2^{165511106551055} is an apocalyptic number.

165511106551055 is a deficient number, since it is larger than the sum of its proper divisors (33106952591089).

165511106551055 is an equidigital number, since it uses as much as digits as its factorization.

165511106551055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788546817.

The product of its (nonzero) digits is 562500, while the sum is 47.

The spelling of 165511106551055 in words is "one hundred sixty-five trillion, five hundred eleven billion, one hundred six million, five hundred fifty-one thousand, fifty-five".