165129052551 has 4 divisors (see below), whose sum is σ = 220172070072. Its totient is φ = 110086035032.

The previous prime is 165129052519. The next prime is 165129052619. The reversal of 165129052551 is 155250921561.

165129052551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165129052551 - 2⁵ = 165129052519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165129052051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27521508756 + ... + 27521508761.

It is an arithmetic number, because the mean of its divisors is an integer number (55043017518).

Almost surely, 2^165129052551 is an apocalyptic number.

165129052551 is a deficient number, since it is larger than the sum of its proper divisors (55043017521).

165129052551 is an equidigital number, since it uses as much as digits as its factorization.

165129052551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55043017520.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 165129052551 in words is "one hundred sixty-five billion, one hundred twenty-nine million, fifty-two thousand, five hundred fifty-one".