128251673186721 has 48 divisors (see below), whose sum is σ = 206703817979904. Its totient is φ = 69279519643488.

The previous prime is 128251673186699. The next prime is 128251673186783. The reversal of 128251673186721 is 127681376152821.

It is not a de Polignac number, because 128251673186721 - 2²³ = 128251664798113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128251673136721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14759451 + ... + 21779456.

It is an arithmetic number, because the mean of its divisors is an integer number (4306329541248).

Almost surely, 2^{128251673186721} is an apocalyptic number.

It is an amenable number.

128251673186721 is a deficient number, since it is larger than the sum of its proper divisors (78452144793183).

128251673186721 is a wasteful number, since it uses less digits than its factorization.

128251673186721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36539418 (or 36539399 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 60.

The spelling of 128251673186721 in words is "one hundred twenty-eight trillion, two hundred fifty-one billion, six hundred seventy-three million, one hundred eighty-six thousand, seven hundred twenty-one".