1668685187 has 8 divisors (see below), whose sum is σ = 1804761504. Its totient is φ = 1533711168.

The previous prime is 1668685129. The next prime is 1668685189. The reversal of 1668685187 is 7815868661.

It is a happy number.

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 1668685187 - 2⁸ = 1668684931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668685189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272423 + ... + 278480.

It is an arithmetic number, because the mean of its divisors is an integer number (225595188).

Almost surely, 2^1668685187 is an apocalyptic number.

1668685187 is a deficient number, since it is larger than the sum of its proper divisors (136076317).

1668685187 is a wasteful number, since it uses less digits than its factorization.

1668685187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551149.

The product of its digits is 3870720, while the sum is 56.

The square root of 1668685187 is about 40849.5432899806. The cubic root of 1668685187 is about 1186.1095524933.

The spelling of 1668685187 in words is "one billion, six hundred sixty-eight million, six hundred eighty-five thousand, one hundred eighty-seven".