66428504725 has 24 divisors (see below), whose sum is σ = 89872497792. Its totient is φ = 48304732800.

The previous prime is 66428504713. The next prime is 66428504743. The reversal of 66428504725 is 52740582466.

It is not a de Polignac number, because 66428504725 - 2¹⁵ = 66428471957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2666929 + ... + 2691721.

It is an arithmetic number, because the mean of its divisors is an integer number (3744687408).

Almost surely, 2^66428504725 is an apocalyptic number.

It is an amenable number.

66428504725 is a deficient number, since it is larger than the sum of its proper divisors (23443993067).

66428504725 is a wasteful number, since it uses less digits than its factorization.

66428504725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34557 (or 34552 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 49.

The spelling of 66428504725 in words is "sixty-six billion, four hundred twenty-eight million, five hundred four thousand, seven hundred twenty-five".