66345565 has 16 divisors (see below), whose sum is σ = 93534336. Its totient is φ = 44539200.

The previous prime is 66345557. The next prime is 66345571. The reversal of 66345565 is 56554366.

It is a happy number.

It is not a de Polignac number, because 66345565 - 2³ = 66345557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45681 + ... + 47110.

It is an arithmetic number, because the mean of its divisors is an integer number (5845896).

Almost surely, 2^66345565 is an apocalyptic number.

66345565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66345565 is a deficient number, since it is larger than the sum of its proper divisors (27188771).

66345565 is a wasteful number, since it uses less digits than its factorization.

66345565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92820.

The product of its digits is 324000, while the sum is 40.

The square root of 66345565 is about 8145.2786938201. The cubic root of 66345565 is about 404.8280833111.

The spelling of 66345565 in words is "sixty-six million, three hundred forty-five thousand, five hundred sixty-five".