1668660735 has 16 divisors (see below), whose sum is σ = 3051265536. Its totient is φ = 762816288.

The previous prime is 1668660727. The next prime is 1668660737. The reversal of 1668660735 is 5370668661.

It is not a de Polignac number, because 1668660735 - 2³ = 1668660727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668660737) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7945899 + ... + 7946108.

It is an arithmetic number, because the mean of its divisors is an integer number (190704096).

Almost surely, 2^1668660735 is an apocalyptic number.

1668660735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668660735 is a deficient number, since it is larger than the sum of its proper divisors (1382604801).

1668660735 is a wasteful number, since it uses less digits than its factorization.

1668660735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15892022.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The square root of 1668660735 is about 40849.2439954524. The cubic root of 1668660735 is about 1186.1037589314.

It can be divided in two parts, 16686 and 60735, that added together give a triangular number (77421 = T₃₉₃).

The spelling of 1668660735 in words is "one billion, six hundred sixty-eight million, six hundred sixty thousand, seven hundred thirty-five".