128261788751 has 16 divisors (see below), whose sum is σ = 139304769408. Its totient is φ = 117615360000.

The previous prime is 128261788741. The next prime is 128261788793. The reversal of 128261788751 is 157887162821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128261788751 - 2¹⁸ = 128261526607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128261788741) 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, 400931 + ... + 645963.

It is an arithmetic number, because the mean of its divisors is an integer number (8706548088).

Almost surely, 2^128261788751 is an apocalyptic number.

128261788751 is a deficient number, since it is larger than the sum of its proper divisors (11042980657).

128261788751 is a wasteful number, since it uses less digits than its factorization.

128261788751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245842.

The product of its digits is 3010560, while the sum is 56.

The spelling of 128261788751 in words is "one hundred twenty-eight billion, two hundred sixty-one million, seven hundred eighty-eight thousand, seven hundred fifty-one".