66709019825 has 12 divisors (see below), whose sum is σ = 94536211200. Its totient is φ = 45743327760.

The previous prime is 66709019801. The next prime is 66709019831. The reversal of 66709019825 is 52891090766.

66709019825 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 66709019825 - 2¹⁰ = 66709018801 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190597025 + ... + 190597374.

It is an arithmetic number, because the mean of its divisors is an integer number (7878017600).

Almost surely, 2^66709019825 is an apocalyptic number.

It is an amenable number.

66709019825 is a deficient number, since it is larger than the sum of its proper divisors (27827191375).

66709019825 is a wasteful number, since it uses less digits than its factorization.

66709019825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381194416 (or 381194411 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 66709019825 in words is "sixty-six billion, seven hundred nine million, nineteen thousand, eight hundred twenty-five".