66239975 has 12 divisors (see below), whose sum is σ = 82427016. Its totient is φ = 52805280.

The previous prime is 66239923. The next prime is 66239989. The reversal of 66239975 is 57993266.

It is not a de Polignac number, because 66239975 - 2¹² = 66235879 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 2804 + ... + 11846.

It is an arithmetic number, because the mean of its divisors is an integer number (6868918).

Almost surely, 2^66239975 is an apocalyptic number.

66239975 is a deficient number, since it is larger than the sum of its proper divisors (16187041).

66239975 is a wasteful number, since it uses less digits than its factorization.

66239975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9346 (or 9341 counting only the distinct ones).

The product of its digits is 612360, while the sum is 47.

The square root of 66239975 is about 8138.7944438965. The cubic root of 66239975 is about 404.6132058773.

The spelling of 66239975 in words is "sixty-six million, two hundred thirty-nine thousand, nine hundred seventy-five".