128023702417 has 4 divisors (see below), whose sum is σ = 137871679540. Its totient is φ = 118175725296.

The previous prime is 128023702409. The next prime is 128023702421. The reversal of 128023702417 is 714207320821.

It is a Cunningham number, because it is equal to 357804²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18938163456 + 109085538961 = 137616^2 + 330281^2 .

It is a cyclic number.

It is not a de Polignac number, because 128023702417 - 2³ = 128023702409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128023702487) 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, 4923988542 + ... + 4923988567.

It is an arithmetic number, because the mean of its divisors is an integer number (34467919885).

Almost surely, 2^128023702417 is an apocalyptic number.

It is an amenable number.

128023702417 is a deficient number, since it is larger than the sum of its proper divisors (9847977123).

128023702417 is an equidigital number, since it uses as much as digits as its factorization.

128023702417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9847977122.

The product of its (nonzero) digits is 37632, while the sum is 37.

The spelling of 128023702417 in words is "one hundred twenty-eight billion, twenty-three million, seven hundred two thousand, four hundred seventeen".