66365565 has 16 divisors (see below), whose sum is σ = 121354368. Its totient is φ = 30338496.

The previous prime is 66365561. The next prime is 66365581. The reversal of 66365565 is 56556366.

It is not a de Polignac number, because 66365565 - 2² = 66365561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66365561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315922 + ... + 316131.

It is an arithmetic number, because the mean of its divisors is an integer number (7584648).

Almost surely, 2^66365565 is an apocalyptic number.

It is an amenable number.

66365565 is a deficient number, since it is larger than the sum of its proper divisors (54988803).

66365565 is a wasteful number, since it uses less digits than its factorization.

66365565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632068.

The product of its digits is 486000, while the sum is 42.

The square root of 66365565 is about 8146.5063063868. The cubic root of 66365565 is about 404.8687579628.

The spelling of 66365565 in words is "sixty-six million, three hundred sixty-five thousand, five hundred sixty-five".