8172257668 has 6 divisors (see below), whose sum is σ = 14301450926. Its totient is φ = 4086128832.

The previous prime is 8172257641. The next prime is 8172257689. The reversal of 8172257668 is 8667522718.

It can be written as a sum of positive squares in only one way, i.e., 6903615744 + 1268641924 = 83088^2 + 35618^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021532205 + ... + 1021532212.

Almost surely, 2^8172257668 is an apocalyptic number.

It is an amenable number.

8172257668 is a deficient number, since it is larger than the sum of its proper divisors (6129193258).

8172257668 is a wasteful number, since it uses less digits than its factorization.

8172257668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043064421 (or 2043064419 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The square root of 8172257668 is about 90400.5401975010. The cubic root of 8172257668 is about 2014.2529905089.

The spelling of 8172257668 in words is "eight billion, one hundred seventy-two million, two hundred fifty-seven thousand, six hundred sixty-eight".