66575015 has 12 divisors (see below), whose sum is σ = 86509224. Its totient is φ = 49162464.

The previous prime is 66574999. The next prime is 66575027. The reversal of 66575015 is 51057566.

It is not a de Polignac number, because 66575015 - 2⁴ = 66574999 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, 38549 + ... + 40238.

It is an arithmetic number, because the mean of its divisors is an integer number (7209102).

Almost surely, 2^66575015 is an apocalyptic number.

66575015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66575015 is a deficient number, since it is larger than the sum of its proper divisors (19934209).

66575015 is a wasteful number, since it uses less digits than its factorization.

66575015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78818 (or 78805 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 66575015 is about 8159.3513835353. The cubic root of 66575015 is about 405.2942331721.

The spelling of 66575015 in words is "sixty-six million, five hundred seventy-five thousand, fifteen".