66550605 has 48 divisors (see below), whose sum is σ = 120325632. Its totient is φ = 31363200.

The previous prime is 66550577. The next prime is 66550609. The reversal of 66550605 is 50605566.

It is not a de Polignac number, because 66550605 - 2¹² = 66546509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550609) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 66660 + ... + 67650.

It is an arithmetic number, because the mean of its divisors is an integer number (2506784).

Almost surely, 2^66550605 is an apocalyptic number.

It is an amenable number.

66550605 is a deficient number, since it is larger than the sum of its proper divisors (53775027).

66550605 is a wasteful number, since it uses less digits than its factorization.

66550605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 66550605 is about 8157.8554167134. The cubic root of 66550605 is about 405.2446928572.

The spelling of 66550605 in words is "sixty-six million, five hundred fifty thousand, six hundred five".