1668745955 has 4 divisors (see below), whose sum is σ = 2002495152. Its totient is φ = 1334996760.

The previous prime is 1668745901. The next prime is 1668745963. The reversal of 1668745955 is 5595478661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1668745955 - 2¹² = 1668741859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668745955.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166874591 + ... + 166874600.

It is an arithmetic number, because the mean of its divisors is an integer number (500623788).

Almost surely, 2^1668745955 is an apocalyptic number.

1668745955 is a deficient number, since it is larger than the sum of its proper divisors (333749197).

1668745955 is an equidigital number, since it uses as much as digits as its factorization.

1668745955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333749196.

The product of its digits is 9072000, while the sum is 56.

The square root of 1668745955 is about 40850.2870858945. The cubic root of 1668745955 is about 1186.1239503819.

The spelling of 1668745955 in words is "one billion, six hundred sixty-eight million, seven hundred forty-five thousand, nine hundred fifty-five".