1668689883 has 16 divisors (see below), whose sum is σ = 2825295360. Its totient is φ = 953536968.

The previous prime is 1668689881. The next prime is 1668689887. The reversal of 1668689883 is 3889868661.

It is not a de Polignac number, because 1668689883 - 2¹ = 1668689881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 1668689883.

It is not an unprimeable number, because it can be changed into a prime (1668689881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4414335 + ... + 4414712.

It is an arithmetic number, because the mean of its divisors is an integer number (176580960).

Almost surely, 2^1668689883 is an apocalyptic number.

1668689883 is a deficient number, since it is larger than the sum of its proper divisors (1156605477).

1668689883 is an equidigital number, since it uses as much as digits as its factorization.

1668689883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8829063 (or 8829057 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 63.

The square root of 1668689883 is about 40849.6007691630. The cubic root of 1668689883 is about 1186.1106651388.

The spelling of 1668689883 in words is "one billion, six hundred sixty-eight million, six hundred eighty-nine thousand, eight hundred eighty-three".