1606555666155 has 24 divisors (see below), whose sum is σ = 2825413604496. Its totient is φ = 778936079680.

The previous prime is 1606555666151. The next prime is 1606555666213. The reversal of 1606555666155 is 5516665556061.

It is not a de Polignac number, because 1606555666155 - 2² = 1606555666151 is a prime.

It is a super-2 number, since 2×1606555666155² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1606555666095 and 1606555666104.

It is not an unprimeable number, because it can be changed into a prime (1606555666151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442575504 + ... + 442579133.

It is an arithmetic number, because the mean of its divisors is an integer number (117725566854).

Almost surely, 2^{1606555666155} is an apocalyptic number.

1606555666155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1606555666155 is a deficient number, since it is larger than the sum of its proper divisors (1218857938341).

1606555666155 is a wasteful number, since it uses less digits than its factorization.

1606555666155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885154667 (or 885154656 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 57.

The spelling of 1606555666155 in words is "one trillion, six hundred six billion, five hundred fifty-five million, six hundred sixty-six thousand, one hundred fifty-five".