2165375906550 has 96 divisors (see below), whose sum is σ = 6128078983200. Its totient is φ = 561827249280.

The previous prime is 2165375906543. The next prime is 2165375906567. The reversal of 2165375906550 is 556095735612.

2165375906550 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 37 + 59 + 0 + 6 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 47 ways as a sum of consecutive naturals, for example, 21625485 + ... + 21725384.

It is an arithmetic number, because the mean of its divisors is an integer number (63834156075).

Almost surely, 2^{2165375906550} is an apocalyptic number.

2165375906550 is an abundant number, since it is smaller than the sum of its proper divisors (3962703076650).

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

2165375906550 is a wasteful number, since it uses less digits than its factorization.

2165375906550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43350927 (or 43350916 counting only the distinct ones).

The product of its (nonzero) digits is 8505000, while the sum is 54.

The spelling of 2165375906550 in words is "two trillion, one hundred sixty-five billion, three hundred seventy-five million, nine hundred six thousand, five hundred fifty".