668898187775 has 24 divisors (see below), whose sum is σ = 840622536000. Its totient is φ = 527926784000.

The previous prime is 668898187753. The next prime is 668898187777. The reversal of 668898187775 is 577781898866.

It is a de Polignac number, because none of the positive numbers 2^k-668898187775 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668898187775.

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 23 ways as a sum of consecutive naturals, for example, 664250 + ... + 1333800.

It is an arithmetic number, because the mean of its divisors is an integer number (35025939000).

Almost surely, 2^668898187775 is an apocalyptic number.

668898187775 is a deficient number, since it is larger than the sum of its proper divisors (171724348225).

668898187775 is a wasteful number, since it uses less digits than its factorization.

668898187775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670099 (or 670094 counting only the distinct ones).

The product of its digits is 2275983360, while the sum is 80.

The spelling of 668898187775 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, seven hundred seventy-five".