668019898 has 32 divisors (see below), whose sum is σ = 1298183040. Its totient is φ = 250361280.

The previous prime is 668019893. The next prime is 668019943. The reversal of 668019898 is 898910866.

It is not an unprimeable number, because it can be changed into a prime (668019893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93133 + ... + 100048.

It is an arithmetic number, because the mean of its divisors is an integer number (40568220).

Almost surely, 2^668019898 is an apocalyptic number.

668019898 is a deficient number, since it is larger than the sum of its proper divisors (630163142).

668019898 is a wasteful number, since it uses less digits than its factorization.

668019898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193222.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 668019898 is about 25846.0809021407. The cubic root of 668019898 is about 874.1711434824.

The spelling of 668019898 in words is "six hundred sixty-eight million, nineteen thousand, eight hundred ninety-eight".