128178049525 has 12 divisors (see below), whose sum is σ = 165851250912. Its totient is φ = 98084072240.

The previous prime is 128178049523. The next prime is 128178049529. The reversal of 128178049525 is 525940871821.

It is not a de Polignac number, because 128178049525 - 2¹ = 128178049523 is a prime.

It is a super-2 number, since 2×128178049525² (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 (128178049523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111458599 + ... + 111459748.

It is an arithmetic number, because the mean of its divisors is an integer number (13820937576).

Almost surely, 2^128178049525 is an apocalyptic number.

It is an amenable number.

128178049525 is a deficient number, since it is larger than the sum of its proper divisors (37673201387).

128178049525 is a wasteful number, since it uses less digits than its factorization.

128178049525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222918380 (or 222918375 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 128178049525 in words is "one hundred twenty-eight billion, one hundred seventy-eight million, forty-nine thousand, five hundred twenty-five".