1668964045 has 16 divisors (see below), whose sum is σ = 2314586880. Its totient is φ = 1131571584.

The previous prime is 1668964027. The next prime is 1668964061. The reversal of 1668964045 is 5404698661.

It is a cyclic number.

It is not a de Polignac number, because 1668964045 - 2⁵ = 1668964013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1668964045.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264777 + ... + 271006.

It is an arithmetic number, because the mean of its divisors is an integer number (144661680).

Almost surely, 2^1668964045 is an apocalyptic number.

It is an amenable number.

1668964045 is a deficient number, since it is larger than the sum of its proper divisors (645622835).

1668964045 is an equidigital number, since it uses as much as digits as its factorization.

1668964045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535884.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 1668964045 is about 40852.9563801691. The cubic root of 1668964045 is about 1186.1756200210.

The spelling of 1668964045 in words is "one billion, six hundred sixty-eight million, nine hundred sixty-four thousand, forty-five".