128177328775 has 12 divisors (see below), whose sum is σ = 158985188632. Its totient is φ = 102512636640.

The previous prime is 128177328749. The next prime is 128177328779. The reversal of 128177328775 is 577823771821.

It is a happy number.

It is not a de Polignac number, because 128177328775 - 2²¹ = 128175231623 is a prime.

It is a super-2 number, since 2×128177328775² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128177328779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640977 + ... + 816826.

Almost surely, 2^128177328775 is an apocalyptic number.

128177328775 is a deficient number, since it is larger than the sum of its proper divisors (30807859857).

128177328775 is a wasteful number, since it uses less digits than its factorization.

128177328775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461330 (or 1461325 counting only the distinct ones).

The product of its digits is 9219840, while the sum is 58.

The spelling of 128177328775 in words is "one hundred twenty-eight billion, one hundred seventy-seven million, three hundred twenty-eight thousand, seven hundred seventy-five".