2165617552655 has 16 divisors (see below), whose sum is σ = 2612360730240. Its totient is φ = 1723415328768.

The previous prime is 2165617552649. The next prime is 2165617552727. The reversal of 2165617552655 is 5562557165612.

It is a cyclic number.

It is not a de Polignac number, because 2165617552655 - 2¹⁶ = 2165617487119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165617552655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19101626 + ... + 19214664.

It is an arithmetic number, because the mean of its divisors is an integer number (163272545640).

Almost surely, 2^{2165617552655} is an apocalyptic number.

2165617552655 is a deficient number, since it is larger than the sum of its proper divisors (446743177585).

2165617552655 is a wasteful number, since it uses less digits than its factorization.

2165617552655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133090.

The product of its digits is 18900000, while the sum is 56.

The spelling of 2165617552655 in words is "two trillion, one hundred sixty-five billion, six hundred seventeen million, five hundred fifty-two thousand, six hundred fifty-five".