66201575 has 12 divisors (see below), whose sum is σ = 89553048. Its totient is φ = 48146400.

The previous prime is 66201559. The next prime is 66201601. The reversal of 66201575 is 57510266.

It is a happy number.

It is not a de Polignac number, because 66201575 - 2⁴ = 66201559 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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120092 + ... + 120641.

It is an arithmetic number, because the mean of its divisors is an integer number (7462754).

Almost surely, 2^66201575 is an apocalyptic number.

66201575 is a deficient number, since it is larger than the sum of its proper divisors (23351473).

66201575 is a wasteful number, since it uses less digits than its factorization.

66201575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240754 (or 240749 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 66201575 is about 8136.4350301591. The cubic root of 66201575 is about 404.5350046078.

The spelling of 66201575 in words is "sixty-six million, two hundred one thousand, five hundred seventy-five".