2155550165055 has 36 divisors (see below), whose sum is σ = 4346292990312. Its totient is φ = 985394360160.

The previous prime is 2155550165051. The next prime is 2155550165059. The reversal of 2155550165055 is 5505610555512.

It is an interprime number because it is at equal distance from previous prime (2155550165051) and next prime (2155550165059).

It is not a de Polignac number, because 2155550165055 - 2² = 2155550165051 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 2155550165055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155550165051) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 488784681 + ... + 488789090.

It is an arithmetic number, because the mean of its divisors is an integer number (120730360842).

Almost surely, 2^{2155550165055} is an apocalyptic number.

2155550165055 is an abundant number, since it is smaller than the sum of its proper divisors (2190742825257).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155550165055 is a wasteful number, since it uses less digits than its factorization.

2155550165055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977573796 (or 977573786 counting only the distinct ones).

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

The spelling of 2155550165055 in words is "two trillion, one hundred fifty-five billion, five hundred fifty million, one hundred sixty-five thousand, fifty-five".