128748733217 has 4 divisors (see below), whose sum is σ = 138652481940. Its totient is φ = 118844984496.

The previous prime is 128748733213. The next prime is 128748733301. The reversal of 128748733217 is 712337847821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712337847821 = 8069 ⋅88280809.

It can be written as a sum of positive squares in 2 ways, for example, as 31601817361 + 97146915856 = 177769^2 + 311684^2 .

It is a cyclic number.

It is not a de Polignac number, because 128748733217 - 2² = 128748733213 is a prime.

It is a super-4 number, since 4×128748733217⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128748733213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4951874342 + ... + 4951874367.

It is an arithmetic number, because the mean of its divisors is an integer number (34663120485).

Almost surely, 2^128748733217 is an apocalyptic number.

It is an amenable number.

128748733217 is a deficient number, since it is larger than the sum of its proper divisors (9903748723).

128748733217 is an equidigital number, since it uses as much as digits as its factorization.

128748733217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9903748722.

The product of its digits is 3161088, while the sum is 53.

The spelling of 128748733217 in words is "one hundred twenty-eight billion, seven hundred forty-eight million, seven hundred thirty-three thousand, two hundred seventeen".