165021660055 has 16 divisors (see below), whose sum is σ = 236155221504. Its totient is φ = 108237808800.

The previous prime is 165021659969. The next prime is 165021660187. The reversal of 165021660055 is 550066120561.

It is not a de Polignac number, because 165021660055 - 2¹³ = 165021651863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165021659996 and 165021660023.

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, 102497121 + ... + 102498730.

It is an arithmetic number, because the mean of its divisors is an integer number (14759701344).

Almost surely, 2^165021660055 is an apocalyptic number.

165021660055 is a deficient number, since it is larger than the sum of its proper divisors (71133561449).

165021660055 is a wasteful number, since it uses less digits than its factorization.

165021660055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204995886.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 165021660055 in words is "one hundred sixty-five billion, twenty-one million, six hundred sixty thousand, fifty-five".