1668512890 has 32 divisors (see below), whose sum is σ = 3289999680. Its totient is φ = 604204800.

The previous prime is 1668512887. The next prime is 1668512899. The reversal of 1668512890 is 982158661.

It is a self number, because there is not a number n which added to its sum of digits gives 1668512890.

It is not an unprimeable number, because it can be changed into a prime (1668512899) by changing a digit.

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, 4960 + ... + 57979.

It is an arithmetic number, because the mean of its divisors is an integer number (102812490).

Almost surely, 2^1668512890 is an apocalyptic number.

1668512890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668512890 is a deficient number, since it is larger than the sum of its proper divisors (1621486790).

1668512890 is a wasteful number, since it uses less digits than its factorization.

1668512890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63198.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 1668512890 is about 40847.4343135527. The cubic root of 1668512890 is about 1186.0687279061.

The spelling of 1668512890 in words is "one billion, six hundred sixty-eight million, five hundred twelve thousand, eight hundred ninety".