325128865821 has 16 divisors (see below), whose sum is σ = 442758445824. Its totient is φ = 212126552064.

The previous prime is 325128865801. The next prime is 325128865843. The reversal of 325128865821 is 128568821523.

It is a happy number.

It is not a de Polignac number, because 325128865821 - 2⁷ = 325128865693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (325128865801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2279421 + ... + 2417853.

It is an arithmetic number, because the mean of its divisors is an integer number (27672402864).

Almost surely, 2^325128865821 is an apocalyptic number.

It is an amenable number.

325128865821 is a deficient number, since it is larger than the sum of its proper divisors (117629580003).

325128865821 is a wasteful number, since it uses less digits than its factorization.

325128865821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155140.

The product of its digits is 1843200, while the sum is 51.

The spelling of 325128865821 in words is "three hundred twenty-five billion, one hundred twenty-eight million, eight hundred sixty-five thousand, eight hundred twenty-one".