2165661607755 has 32 divisors (see below), whose sum is σ = 3524356696320. Its totient is φ = 1135259798400.

The previous prime is 2165661607649. The next prime is 2165661607783. The reversal of 2165661607755 is 5577061665612.

It is not a de Polignac number, because 2165661607755 - 2¹⁴ = 2165661591371 is a prime.

It is a super-2 number, since 2×2165661607755² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2165661607695 and 2165661607704.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5382204 + ... + 5770566.

It is an arithmetic number, because the mean of its divisors is an integer number (110136146760).

Almost surely, 2^{2165661607755} is an apocalyptic number.

2165661607755 is a deficient number, since it is larger than the sum of its proper divisors (1358695088565).

2165661607755 is a wasteful number, since it uses less digits than its factorization.

2165661607755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394731.

The product of its (nonzero) digits is 15876000, while the sum is 57.

The spelling of 2165661607755 in words is "two trillion, one hundred sixty-five billion, six hundred sixty-one million, six hundred seven thousand, seven hundred fifty-five".