66562665 has 16 divisors (see below), whose sum is σ = 114692928. Its totient is φ = 32769216.

The previous prime is 66562649. The next prime is 66562697. The reversal of 66562665 is 56626566.

It is not a de Polignac number, because 66562665 - 2⁴ = 66562649 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 170479 + ... + 170868.

It is an arithmetic number, because the mean of its divisors is an integer number (7168308).

Almost surely, 2^66562665 is an apocalyptic number.

66562665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66562665 is a deficient number, since it is larger than the sum of its proper divisors (48130263).

66562665 is a wasteful number, since it uses less digits than its factorization.

66562665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341368.

The product of its digits is 388800, while the sum is 42.

The square root of 66562665 is about 8158.5945480824. The cubic root of 66562665 is about 405.2691702496.

The spelling of 66562665 in words is "sixty-six million, five hundred sixty-two thousand, six hundred sixty-five".