66674645 has 16 divisors (see below), whose sum is σ = 83427840. Its totient is φ = 51096000.

The previous prime is 66674627. The next prime is 66674687. The reversal of 66674645 is 54647666.

It is not a de Polignac number, because 66674645 - 2¹⁴ = 66658261 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66674596 and 66674605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13526 + ... + 17784.

It is an arithmetic number, because the mean of its divisors is an integer number (5214240).

Almost surely, 2^66674645 is an apocalyptic number.

It is an amenable number.

66674645 is a deficient number, since it is larger than the sum of its proper divisors (16753195).

66674645 is a wasteful number, since it uses less digits than its factorization.

66674645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396.

The product of its digits is 725760, while the sum is 44.

The square root of 66674645 is about 8165.4543658023. The cubic root of 66674645 is about 405.4963076713.

The spelling of 66674645 in words is "sixty-six million, six hundred seventy-four thousand, six hundred forty-five".