1605555111066 has 64 divisors (see below), whose sum is σ = 3426617779200. Its totient is φ = 499761550080.

The previous prime is 1605555111053. The next prime is 1605555111073. The reversal of 1605555111066 is 6601115555061.

It is a super-3 number, since 3×1605555111066³ (a number of 38 digits) contains 333 as substring.

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, 102866235 + ... + 102881841.

It is an arithmetic number, because the mean of its divisors is an integer number (53540902800).

Almost surely, 2^{1605555111066} is an apocalyptic number.

1605555111066 is an abundant number, since it is smaller than the sum of its proper divisors (1821062668134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605555111066 is a wasteful number, since it uses less digits than its factorization.

1605555111066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23459.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 1605555111066 in words is "one trillion, six hundred five billion, five hundred fifty-five million, one hundred eleven thousand, sixty-six".