1668948998 has 4 divisors (see below), whose sum is σ = 2503423500. Its totient is φ = 834474498.

The previous prime is 1668948971. The next prime is 1668949001. The reversal of 1668948998 is 8998498661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8998498661 = 313 ⋅28749197.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417237248 + ... + 417237251.

It is an arithmetic number, because the mean of its divisors is an integer number (625855875).

Almost surely, 2^1668948998 is an apocalyptic number.

1668948998 is a deficient number, since it is larger than the sum of its proper divisors (834474502).

1668948998 is an equidigital number, since it uses as much as digits as its factorization.

1668948998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834474501.

The product of its digits is 53747712, while the sum is 68.

The square root of 1668948998 is about 40852.7722192754. The cubic root of 1668948998 is about 1186.1720552472.

The spelling of 1668948998 in words is "one billion, six hundred sixty-eight million, nine hundred forty-eight thousand, nine hundred ninety-eight".