66060565 has 16 divisors (see below), whose sum is σ = 80526960. Its totient is φ = 52019200.

The previous prime is 66060563. The next prime is 66060583. The reversal of 66060565 is 56506066.

66060565 = 79² + 80² + ... + 583².

It can be written as a sum of positive squares in 8 ways, for example, as 28826161 + 37234404 = 5369^2 + 6102^2 .

It is not a de Polignac number, because 66060565 - 2¹ = 66060563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66060565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66060563) 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, 129531 + ... + 130039.

It is an arithmetic number, because the mean of its divisors is an integer number (5032935).

Almost surely, 2^66060565 is an apocalyptic number.

It is an amenable number.

66060565 is a deficient number, since it is larger than the sum of its proper divisors (14466395).

66060565 is a wasteful number, since it uses less digits than its factorization.

66060565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 66060565 is about 8127.7650679630. The cubic root of 66060565 is about 404.2475792706.

The spelling of 66060565 in words is "sixty-six million, sixty thousand, five hundred sixty-five".