128200420168 has 8 divisors (see below), whose sum is σ = 240375787830. Its totient is φ = 64100210080.

The previous prime is 128200420157. The next prime is 128200420171. The reversal of 128200420168 is 861024002821.

It can be written as a sum of positive squares in only one way, i.e., 119783825604 + 8416594564 = 346098^2 + 91742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×128200420168² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8012526253 + ... + 8012526268.

Almost surely, 2^128200420168 is an apocalyptic number.

It is an amenable number.

128200420168 is a deficient number, since it is larger than the sum of its proper divisors (112175367662).

128200420168 is a wasteful number, since it uses less digits than its factorization.

128200420168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16025052527 (or 16025052523 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

Adding to 128200420168 its reverse (861024002821), we get a palindrome (989224422989).

The spelling of 128200420168 in words is "one hundred twenty-eight billion, two hundred million, four hundred twenty thousand, one hundred sixty-eight".