66042212725 has 24 divisors (see below), whose sum is σ = 83551830912. Its totient is φ = 51769732800.

The previous prime is 66042212707. The next prime is 66042212767. The reversal of 66042212725 is 52721224066.

66042212725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66042212725 - 2¹⁷ = 66042081653 is a prime.

It is a super-2 number, since 2×66042212725² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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, 318744 + ... + 483406.

It is an arithmetic number, because the mean of its divisors is an integer number (3481326288).

Almost surely, 2^66042212725 is an apocalyptic number.

It is an amenable number.

66042212725 is a deficient number, since it is larger than the sum of its proper divisors (17509618187).

66042212725 is a wasteful number, since it uses less digits than its factorization.

66042212725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164997 (or 164992 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 66042212725 in words is "sixty-six billion, forty-two million, two hundred twelve thousand, seven hundred twenty-five".