1998668471 has 2 divisors, whose sum is σ = 1998668472. Its totient is φ = 1998668470.

The previous prime is 1998668459. The next prime is 1998668473. The reversal of 1998668471 is 1748668991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998668471 - 2¹⁴ = 1998652087 is a prime.

It is a super-3 number, since 3×1998668471³ (a number of 29 digits) contains 333 as substring.

Together with 1998668473, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1998668471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998668473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999334235 + 999334236.

It is an arithmetic number, because the mean of its divisors is an integer number (999334236).

Almost surely, 2^1998668471 is an apocalyptic number.

1998668471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998668471 is an equidigital number, since it uses as much as digits as its factorization.

1998668471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 59.

The square root of 1998668471 is about 44706.4701245804. The cubic root of 1998668471 is about 1259.6413842526.

The spelling of 1998668471 in words is "one billion, nine hundred ninety-eight million, six hundred sixty-eight thousand, four hundred seventy-one".