66505371 has 4 divisors (see below), whose sum is σ = 88673832. Its totient is φ = 44336912.

The previous prime is 66505363. The next prime is 66505379. The reversal of 66505371 is 17350566.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66505363) and next prime (66505379).

It is a cyclic number.

It is not a de Polignac number, because 66505371 - 2³ = 66505363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66505379) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11084226 + ... + 11084231.

It is an arithmetic number, because the mean of its divisors is an integer number (22168458).

Almost surely, 2^66505371 is an apocalyptic number.

66505371 is a deficient number, since it is larger than the sum of its proper divisors (22168461).

66505371 is a wasteful number, since it uses less digits than its factorization.

66505371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22168460.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 66505371 is about 8155.0825256401. The cubic root of 66505371 is about 405.1528580140.

It can be divided in two parts, 6650 and 5371, that added together give a palindrome (12021).

The spelling of 66505371 in words is "sixty-six million, five hundred five thousand, three hundred seventy-one".