128477902569 has 8 divisors (see below), whose sum is σ = 171305692800. Its totient is φ = 85651023696.

The previous prime is 128477902561. The next prime is 128477902573. The reversal of 128477902569 is 965209774821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128477902569 - 2³ = 128477902561 is a prime.

It is a super-2 number, since 2×128477902569² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128477902561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236007 + ... + 559155.

It is an arithmetic number, because the mean of its divisors is an integer number (21413211600).

Almost surely, 2^128477902569 is an apocalyptic number.

It is an amenable number.

128477902569 is a deficient number, since it is larger than the sum of its proper divisors (42827790231).

128477902569 is a wasteful number, since it uses less digits than its factorization.

128477902569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455679.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 128477902569 in words is "one hundred twenty-eight billion, four hundred seventy-seven million, nine hundred two thousand, five hundred sixty-nine".