128560970917 has 16 divisors (see below), whose sum is σ = 132701838192. Its totient is φ = 124471226880.

The previous prime is 128560970861. The next prime is 128560970933. The reversal of 128560970917 is 719079065821.

It is a happy number.

It is a Cunningham number, because it is equal to 358554²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 2597023521 + 125963947396 = 50961^2 + 354914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128560970917 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 (128560970947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3186523 + ... + 3226615.

It is an arithmetic number, because the mean of its divisors is an integer number (8293864887).

Almost surely, 2^128560970917 is an apocalyptic number.

It is an amenable number.

128560970917 is a deficient number, since it is larger than the sum of its proper divisors (4140867275).

128560970917 is a wasteful number, since it uses less digits than its factorization.

128560970917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40728.

The product of its (nonzero) digits is 1905120, while the sum is 55.

The spelling of 128560970917 in words is "one hundred twenty-eight billion, five hundred sixty million, nine hundred seventy thousand, nine hundred seventeen".