1668161287 has 8 divisors (see below), whose sum is σ = 1858429440. Its totient is φ = 1486742880.

The previous prime is 1668161281. The next prime is 1668161303. The reversal of 1668161287 is 7821618661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668161287 - 2³ = 1668161279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668161281) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2212039 + ... + 2212792.

It is an arithmetic number, because the mean of its divisors is an integer number (232303680).

Almost surely, 2^1668161287 is an apocalyptic number.

1668161287 is a deficient number, since it is larger than the sum of its proper divisors (190268153).

1668161287 is a wasteful number, since it uses less digits than its factorization.

1668161287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424873.

The product of its digits is 193536, while the sum is 46.

The square root of 1668161287 is about 40843.1302301868. The cubic root of 1668161287 is about 1185.9854092771.

The spelling of 1668161287 in words is "one billion, six hundred sixty-eight million, one hundred sixty-one thousand, two hundred eighty-seven".