66550365 has 24 divisors (see below), whose sum is σ = 131833728. Its totient is φ = 30422880.

The previous prime is 66550327. The next prime is 66550399. The reversal of 66550365 is 56305566.

It is a happy number.

It is not a de Polignac number, because 66550365 - 2¹⁰ = 66549341 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 105321 + ... + 105950.

It is an arithmetic number, because the mean of its divisors is an integer number (5493072).

Almost surely, 2^66550365 is an apocalyptic number.

It is an amenable number.

66550365 is a deficient number, since it is larger than the sum of its proper divisors (65283363).

66550365 is a wasteful number, since it uses less digits than its factorization.

66550365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211289 (or 211286 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 66550365 is about 8157.8407069518. The cubic root of 66550365 is about 405.2442057149.

The spelling of 66550365 in words is "sixty-six million, five hundred fifty thousand, three hundred sixty-five".