165045421210055 has 4 divisors (see below), whose sum is σ = 198054505452072. Its totient is φ = 132036336968040.

The previous prime is 165045421210003. The next prime is 165045421210057. The reversal of 165045421210055 is 550012124540561.

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

It is a de Polignac number, because none of the positive numbers 2^k-165045421210055 is a prime.

It is a super-3 number, since 3×165045421210055³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165045421209994 and 165045421210021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165045421210057) 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, 16504542121001 + ... + 16504542121010.

It is an arithmetic number, because the mean of its divisors is an integer number (49513626363018).

Almost surely, 2^{165045421210055} is an apocalyptic number.

165045421210055 is a deficient number, since it is larger than the sum of its proper divisors (33009084242017).

165045421210055 is an equidigital number, since it uses as much as digits as its factorization.

165045421210055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33009084242016.

The product of its (nonzero) digits is 240000, while the sum is 41.

The spelling of 165045421210055 in words is "one hundred sixty-five trillion, forty-five billion, four hundred twenty-one million, two hundred ten thousand, fifty-five".