668898187773 has 16 divisors (see below), whose sum is σ = 898203315072. Its totient is φ = 442765440000.

The previous prime is 668898187753. The next prime is 668898187777. The reversal of 668898187773 is 377781898866.

It is a happy number.

It is not a de Polignac number, because 668898187773 - 2⁹ = 668898187261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668898187777) 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, 587913 + ... + 1297473.

It is an arithmetic number, because the mean of its divisors is an integer number (56137707192).

Almost surely, 2^668898187773 is an apocalyptic number.

It is an amenable number.

668898187773 is a deficient number, since it is larger than the sum of its proper divisors (229305127299).

668898187773 is a wasteful number, since it uses less digits than its factorization.

668898187773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711796.

The product of its digits is 1365590016, while the sum is 78.

The spelling of 668898187773 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, seven hundred seventy-three".