165655555505 has 32 divisors (see below), whose sum is σ = 220088171520. Its totient is φ = 118686228480.

The previous prime is 165655555501. The next prime is 165655555519. The reversal of 165655555505 is 505555556561.

It is not a de Polignac number, because 165655555505 - 2² = 165655555501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165655555501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3441041 + ... + 3488849.

It is an arithmetic number, because the mean of its divisors is an integer number (6877755360).

Almost surely, 2^165655555505 is an apocalyptic number.

It is an amenable number.

165655555505 is a deficient number, since it is larger than the sum of its proper divisors (54432616015).

165655555505 is a wasteful number, since it uses less digits than its factorization.

165655555505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48761.

The product of its (nonzero) digits is 14062500, while the sum is 53.

The spelling of 165655555505 in words is "one hundred sixty-five billion, six hundred fifty-five million, five hundred fifty-five thousand, five hundred five".