1605666550550 has 12 divisors (see below), whose sum is σ = 2986539784116. Its totient is φ = 642266620200.

The previous prime is 1605666550531. The next prime is 1605666550603. The reversal of 1605666550550 is 550556665061.

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 32113331011 = 1605666550550 / (1 + 6 + 0 + 5 + 6 + 6 + 6 + 5 + 5 + 0 + 5 + 5 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16056665456 + ... + 16056665555.

It is an arithmetic number, because the mean of its divisors is an integer number (248878315343).

Almost surely, 2^{1605666550550} is an apocalyptic number.

1605666550550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1605666550550 is a deficient number, since it is larger than the sum of its proper divisors (1380873233566).

1605666550550 is a wasteful number, since it uses less digits than its factorization.

1605666550550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32113331023 (or 32113331018 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 1605666550550 in words is "one trillion, six hundred five billion, six hundred sixty-six million, five hundred fifty thousand, five hundred fifty".