66066945 has 32 divisors (see below), whose sum is σ = 123283200. Its totient is φ = 30199680.

The previous prime is 66066899. The next prime is 66066953. The reversal of 66066945 is 54966066.

It is not a de Polignac number, because 66066945 - 2¹⁶ = 66001409 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66066897 and 66066906.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1276 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (3852600).

Almost surely, 2^66066945 is an apocalyptic number.

It is an amenable number.

66066945 is a deficient number, since it is larger than the sum of its proper divisors (57216255).

66066945 is a wasteful number, since it uses less digits than its factorization.

66066945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12870 (or 12856 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 66066945 is about 8128.1575403040. The cubic root of 66066945 is about 404.2605926648.

The spelling of 66066945 in words is "sixty-six million, sixty-six thousand, nine hundred forty-five".