128144796569 has 4 divisors (see below), whose sum is σ = 129465877044. Its totient is φ = 126823716096.

The previous prime is 128144796541. The next prime is 128144796599. The reversal of 128144796569 is 965697441821.

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 19500726025 + 108644070544 = 139645^2 + 329612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128144796569 is a prime.

It is a super-2 number, since 2×128144796569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128144796599) 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, 660540092 + ... + 660540285.

It is an arithmetic number, because the mean of its divisors is an integer number (32366469261).

Almost surely, 2^128144796569 is an apocalyptic number.

It is an amenable number.

128144796569 is a deficient number, since it is larger than the sum of its proper divisors (1321080475).

128144796569 is an equidigital number, since it uses as much as digits as its factorization.

128144796569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321080474.

The product of its digits is 26127360, while the sum is 62.

The spelling of 128144796569 in words is "one hundred twenty-eight billion, one hundred forty-four million, seven hundred ninety-six thousand, five hundred sixty-nine".