66384725 has 24 divisors (see below), whose sum is σ = 90223392. Its totient is φ = 48052800.

The previous prime is 66384719. The next prime is 66384737. The reversal of 66384725 is 52748366.

It is a happy number.

It is not a de Polignac number, because 66384725 - 2²² = 62190421 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

Its product of digits (241920) is a multiple of the sum of its prime divisors (1152).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77399 + ... + 78251.

It is an arithmetic number, because the mean of its divisors is an integer number (3759308).

Almost surely, 2^66384725 is an apocalyptic number.

It is an amenable number.

66384725 is a deficient number, since it is larger than the sum of its proper divisors (23838667).

66384725 is a wasteful number, since it uses less digits than its factorization.

66384725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157 (or 1152 counting only the distinct ones).

The product of its digits is 241920, while the sum is 41.

The square root of 66384725 is about 8147.6821857507. The cubic root of 66384725 is about 404.9077166155.

The spelling of 66384725 in words is "sixty-six million, three hundred eighty-four thousand, seven hundred twenty-five".