66402425888 has 18 divisors (see below), whose sum is σ = 130732645869. Its totient is φ = 33200484096.

The previous prime is 66402425863. The next prime is 66402425893. The reversal of 66402425888 is 88852420466.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

66402425888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60856942864 + 5545483024 = 246692^2 + 74468^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=182212.

It is a super-2 number, since 2×66402425888² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1434920 + ... + 1480472.

Almost surely, 2^66402425888 is an apocalyptic number.

It is an amenable number.

66402425888 is a deficient number, since it is larger than the sum of its proper divisors (64330219981).

66402425888 is an frugal number, since it uses more digits than its factorization.

66402425888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91116 (or 45555 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 53.

The spelling of 66402425888 in words is "sixty-six billion, four hundred two million, four hundred twenty-five thousand, eight hundred eighty-eight".