128126523565 has 16 divisors (see below), whose sum is σ = 160969939200. Its totient is φ = 97774315072.

The previous prime is 128126523529. The next prime is 128126523583. The reversal of 128126523565 is 565325621821.

It is a cyclic number.

It is not a de Polignac number, because 128126523565 - 2⁹ = 128126523053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5311045 + ... + 5335114.

It is an arithmetic number, because the mean of its divisors is an integer number (10060621200).

Almost surely, 2^128126523565 is an apocalyptic number.

It is an amenable number.

128126523565 is a deficient number, since it is larger than the sum of its proper divisors (32843415635).

128126523565 is a wasteful number, since it uses less digits than its factorization.

128126523565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646276.

The product of its digits is 864000, while the sum is 46.

The spelling of 128126523565 in words is "one hundred twenty-eight billion, one hundred twenty-six million, five hundred twenty-three thousand, five hundred sixty-five".