2165771602553 has 16 divisors (see below), whose sum is σ = 2346285043200. Its totient is φ = 1987262290944.

The previous prime is 2165771602471. The next prime is 2165771602613. The reversal of 2165771602553 is 3552061775612.

It is not a de Polignac number, because 2165771602553 - 2¹⁰ = 2165771601529 is a prime.

It is a super-2 number, since 2×2165771602553² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165771502553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2882648 + ... + 3555446.

It is an arithmetic number, because the mean of its divisors is an integer number (146642815200).

Almost surely, 2^{2165771602553} is an apocalyptic number.

It is an amenable number.

2165771602553 is a deficient number, since it is larger than the sum of its proper divisors (180513440647).

2165771602553 is a wasteful number, since it uses less digits than its factorization.

2165771602553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674288.

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 2165771602553 in words is "two trillion, one hundred sixty-five billion, seven hundred seventy-one million, six hundred two thousand, five hundred fifty-three".