1668469779 has 32 divisors (see below), whose sum is σ = 2539837440. Its totient is φ = 1081990656.

The previous prime is 1668469771. The next prime is 1668469801. The reversal of 1668469779 is 9779648661.

1668469779 is a `hidden beast` number, since 166 + 8 + 469 + 7 + 7 + 9 = 666.

It is not a de Polignac number, because 1668469779 - 2³ = 1668469771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668469771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207987 + ... + 215859.

It is an arithmetic number, because the mean of its divisors is an integer number (79369920).

Almost surely, 2^1668469779 is an apocalyptic number.

1668469779 is a deficient number, since it is larger than the sum of its proper divisors (871367661).

1668469779 is a wasteful number, since it uses less digits than its factorization.

1668469779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8096 (or 8090 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The square root of 1668469779 is about 40846.9066025813. The cubic root of 1668469779 is about 1186.0585126121.

The spelling of 1668469779 in words is "one billion, six hundred sixty-eight million, four hundred sixty-nine thousand, seven hundred seventy-nine".