66363565 has 8 divisors (see below), whose sum is σ = 80425368. Its totient is φ = 52564800.

The previous prime is 66363553. The next prime is 66363589. The reversal of 66363565 is 56536366.

It can be written as a sum of positive squares in 4 ways, for example, as 37429924 + 28933641 = 6118^2 + 5379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66363565 - 2²¹ = 64266413 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 7 ways as a sum of consecutive naturals, for example, 65202 + ... + 66211.

It is an arithmetic number, because the mean of its divisors is an integer number (10053171).

Almost surely, 2^66363565 is an apocalyptic number.

It is an amenable number.

66363565 is a deficient number, since it is larger than the sum of its proper divisors (14061803).

66363565 is a wasteful number, since it uses less digits than its factorization.

66363565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131519.

The product of its digits is 291600, while the sum is 40.

The square root of 66363565 is about 8146.3835534549. The cubic root of 66363565 is about 404.8646908654.

It can be divided in two parts, 6636 and 3565, that added together give a palindrome (10201).

The spelling of 66363565 in words is "sixty-six million, three hundred sixty-three thousand, five hundred sixty-five".