165605655011565 has 32 divisors (see below), whose sum is σ = 274110522094080. Its totient is φ = 85275960433664.

The previous prime is 165605655011527. The next prime is 165605655011617. The reversal of 165605655011565 is 565110556506561.

165605655011565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165605655011565 - 2¹⁶ = 165605654946029 is a prime.

It is a Curzon number.

It is a congruent number.

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, 22935772 + ... + 29279018.

It is an arithmetic number, because the mean of its divisors is an integer number (8565953815440).

Almost surely, 2^{165605655011565} is an apocalyptic number.

165605655011565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165605655011565 is a deficient number, since it is larger than the sum of its proper divisors (108504867082515).

165605655011565 is a wasteful number, since it uses less digits than its factorization.

165605655011565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6403301.

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 165605655011565 in words is "one hundred sixty-five trillion, six hundred five billion, six hundred fifty-five million, eleven thousand, five hundred sixty-five".