66505365 has 12 divisors (see below), whose sum is σ = 115276044. Its totient is φ = 35469504.

The previous prime is 66505363. The next prime is 66505379. The reversal of 66505365 is 56350566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25979409 + 40525956 = 5097^2 + 6366^2 .

It is not a de Polignac number, because 66505365 - 2¹ = 66505363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 738904 + ... + 738993.

It is an arithmetic number, because the mean of its divisors is an integer number (9606337).

Almost surely, 2^66505365 is an apocalyptic number.

It is an amenable number.

66505365 is a deficient number, since it is larger than the sum of its proper divisors (48770679).

66505365 is a wasteful number, since it uses less digits than its factorization.

66505365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477908 (or 1477905 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 66505365 is about 8155.0821577713. The cubic root of 66505365 is about 405.1528458300.

The spelling of 66505365 in words is "sixty-six million, five hundred five thousand, three hundred sixty-five".