66266505 has 20 divisors (see below), whose sum is σ = 118789572. Its totient is φ = 35341920.

The previous prime is 66266503. The next prime is 66266507. The reversal of 66266505 is 50566266.

It is an interprime number because it is at equal distance from previous prime (66266503) and next prime (66266507).

It can be written as a sum of positive squares in 2 ways, for example, as 11269449 + 54997056 = 3357^2 + 7416^2 .

It is not a de Polignac number, because 66266505 - 2¹ = 66266503 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66266505.

It is not an unprimeable number, because it can be changed into a prime (66266503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 81406 + ... + 82215.

Almost surely, 2^66266505 is an apocalyptic number.

It is an amenable number.

66266505 is a deficient number, since it is larger than the sum of its proper divisors (52523067).

66266505 is a wasteful number, since it uses less digits than its factorization.

66266505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163638 (or 163629 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 66266505 is about 8140.4241289997. The cubic root of 66266505 is about 404.6672163425.

It can be divided in two parts, 6626 and 6505, that added together give a palindrome (13131).

The spelling of 66266505 in words is "sixty-six million, two hundred sixty-six thousand, five hundred five".