668138495098 has 8 divisors (see below), whose sum is σ = 1008000851508.
Its totient is φ = 332138211264.
The previous prime is 668138495083. The next prime is 668138495113. The reversal of 668138495098 is 890594831866.
It is an interprime number because it is at equal distance from previous prime (668138495083) and next prime (668138495113).
It can be written as a sum of positive squares in 2 ways, for example, as 585489719929 + 82648775169 = 765173^2 + 287487^2
It is a sphenic number, since it is the product of 3 distinct primes.
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, 965517711 + ... + 965518402.
Almost surely, 2668138495098 is an apocalyptic number.
668138495098 is a deficient number, since it is larger than the sum of its proper divisors (339862356410).
668138495098 is a wasteful number, since it uses less digits than its factorization.
668138495098 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1931036288.
The product of its (nonzero) digits is 89579520, while the sum is 67.
The spelling of 668138495098 in words is "six hundred sixty-eight billion, one hundred thirty-eight million, four hundred ninety-five thousand, ninety-eight".