165555125055 has 72 divisors (see below), whose sum is σ = 297408069504. Its totient is φ = 85106131200.

The previous prime is 165555125053. The next prime is 165555125059. The reversal of 165555125055 is 550521555561.

It is not a de Polignac number, because 165555125055 - 2¹ = 165555125053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 165555125055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165555125051) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 140181565 + ... + 140182745.

It is an arithmetic number, because the mean of its divisors is an integer number (4130667632).

Almost surely, 2^165555125055 is an apocalyptic number.

165555125055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165555125055 is a deficient number, since it is larger than the sum of its proper divisors (131852944449).

165555125055 is a wasteful number, since it uses less digits than its factorization.

165555125055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 937500, while the sum is 45.

The spelling of 165555125055 in words is "one hundred sixty-five billion, five hundred fifty-five million, one hundred twenty-five thousand, fifty-five".