128537665025 has 24 divisors (see below), whose sum is σ = 198715894464. Its totient is φ = 80127374400.

The previous prime is 128537665007. The next prime is 128537665031. The reversal of 128537665025 is 520566735821.

It is not a de Polignac number, because 128537665025 - 2¹⁸ = 128537402881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 33384482 + ... + 33388331.

It is an arithmetic number, because the mean of its divisors is an integer number (8279828936).

Almost surely, 2^128537665025 is an apocalyptic number.

It is an amenable number.

128537665025 is a deficient number, since it is larger than the sum of its proper divisors (70178229439).

128537665025 is a wasteful number, since it uses less digits than its factorization.

128537665025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66772841 (or 66772836 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 128537665025 in words is "one hundred twenty-eight billion, five hundred thirty-seven million, six hundred sixty-five thousand, twenty-five".