1998718606 has 8 divisors (see below), whose sum is σ = 2999679120. Its totient is φ = 998825568.

The previous prime is 1998718571. The next prime is 1998718627. The reversal of 1998718606 is 6068178991.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262171 + ... + 269686.

It is an arithmetic number, because the mean of its divisors is an integer number (374959890).

Almost surely, 2^1998718606 is an apocalyptic number.

1998718606 is a deficient number, since it is larger than the sum of its proper divisors (1000960514).

1998718606 is a wasteful number, since it uses less digits than its factorization.

1998718606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533738.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 1998718606 is about 44707.0308340869. The cubic root of 1998718606 is about 1259.6519165301.

The spelling of 1998718606 in words is "one billion, nine hundred ninety-eight million, seven hundred eighteen thousand, six hundred six".