66273565 has 12 divisors (see below), whose sum is σ = 84301884. Its totient is φ = 49843584.

The previous prime is 66273563. The next prime is 66273587. The reversal of 66273565 is 56537266.

It can be written as a sum of positive squares in 2 ways, for example, as 38204761 + 28068804 = 6181^2 + 5298^2 .

It is not a de Polignac number, because 66273565 - 2¹ = 66273563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66273563) 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, 74614 + ... + 75496.

It is an arithmetic number, because the mean of its divisors is an integer number (7025157).

Almost surely, 2^66273565 is an apocalyptic number.

It is an amenable number.

66273565 is a deficient number, since it is larger than the sum of its proper divisors (18028319).

66273565 is an frugal number, since it uses more digits than its factorization.

66273565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 905 counting only the distinct ones).

The product of its digits is 226800, while the sum is 40.

The square root of 66273565 is about 8140.8577557896. The cubic root of 66273565 is about 404.6815868458.

The spelling of 66273565 in words is "sixty-six million, two hundred seventy-three thousand, five hundred sixty-five".