1331606205165 has 16 divisors (see below), whose sum is σ = 2156239447488. Its totient is φ = 701633469696.

The previous prime is 1331606205161. The next prime is 1331606205217. The reversal of 1331606205165 is 5615026061331.

It is not a de Polignac number, because 1331606205165 - 2² = 1331606205161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331606205161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534780364 + ... + 534782853.

It is an arithmetic number, because the mean of its divisors is an integer number (134764965468).

Almost surely, 2^{1331606205165} is an apocalyptic number.

1331606205165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331606205165 is a deficient number, since it is larger than the sum of its proper divisors (824633242323).

1331606205165 is a wasteful number, since it uses less digits than its factorization.

1331606205165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069563308.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 1331606205165 in words is "one trillion, three hundred thirty-one billion, six hundred six million, two hundred five thousand, one hundred sixty-five".