1668716658 has 36 divisors (see below), whose sum is σ = 4205849310. Its totient is φ = 476775936.

The previous prime is 1668716611. The next prime is 1668716659. The reversal of 1668716658 is 8566178661.

It can be written as a sum of positive squares in only one way, i.e., 1176009849 + 492706809 = 34293^2 + 22197^2 .

It is not an unprimeable number, because it can be changed into a prime (1668716659) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 945103 + ... + 946866.

Almost surely, 2^1668716658 is an apocalyptic number.

1668716658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1668716658 is an abundant number, since it is smaller than the sum of its proper divisors (2537132652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668716658 is a wasteful number, since it uses less digits than its factorization.

1668716658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891991 (or 1891981 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1668716658 is about 40849.9284944295. The cubic root of 1668716658 is about 1186.1170090264.

The spelling of 1668716658 in words is "one billion, six hundred sixty-eight million, seven hundred sixteen thousand, six hundred fifty-eight".