1605566660511 has 8 divisors (see below), whose sum is σ = 2335369688064. Its totient is φ = 973070703320.

The previous prime is 1605566660497. The next prime is 1605566660557. The reversal of 1605566660511 is 1150666655061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1605566660511 - 2⁶ = 1605566660447 is a prime.

It is a super-2 number, since 2×1605566660511² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605566660561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24326767551 + ... + 24326767616.

It is an arithmetic number, because the mean of its divisors is an integer number (291921211008).

Almost surely, 2^{1605566660511} is an apocalyptic number.

1605566660511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1605566660511 is a deficient number, since it is larger than the sum of its proper divisors (729803027553).

1605566660511 is a wasteful number, since it uses less digits than its factorization.

1605566660511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48653535181.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1605566660511 in words is "one trillion, six hundred five billion, five hundred sixty-six million, six hundred sixty thousand, five hundred eleven".