665499999998 has 32 divisors (see below), whose sum is σ = 1060423056000. Its totient is φ = 312695149536.

The previous prime is 665499999977. The next prime is 665500000037. The reversal of 665499999998 is 899999994566.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234353 + ... + 1177251.

It is an arithmetic number, because the mean of its divisors is an integer number (33138220500).

Almost surely, 2^665499999998 is an apocalyptic number.

665499999998 is a deficient number, since it is larger than the sum of its proper divisors (394923056002).

665499999998 is a wasteful number, since it uses less digits than its factorization.

665499999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943256.

The product of its digits is 27549901440, while the sum is 92.

The spelling of 665499999998 in words is "six hundred sixty-five billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".