1668718929 has 16 divisors (see below), whose sum is σ = 2356760448. Its totient is φ = 1046629632.

The previous prime is 1668718873. The next prime is 1668718949. The reversal of 1668718929 is 9298178661.

It is not a de Polignac number, because 1668718929 - 2¹² = 1668714833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668718949) 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, 175239 + ... + 184515.

It is an arithmetic number, because the mean of its divisors is an integer number (147297528).

Almost surely, 2^1668718929 is an apocalyptic number.

It is an amenable number.

1668718929 is a deficient number, since it is larger than the sum of its proper divisors (688041519).

1668718929 is a wasteful number, since it uses less digits than its factorization.

1668718929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12824.

The product of its digits is 2612736, while the sum is 57.

The square root of 1668718929 is about 40849.9562912863. The cubic root of 1668718929 is about 1186.1175470987.

The spelling of 1668718929 in words is "one billion, six hundred sixty-eight million, seven hundred eighteen thousand, nine hundred twenty-nine".