66303261 has 6 divisors (see below), whose sum is σ = 95771390. Its totient is φ = 44202168.

The previous prime is 66303253. The next prime is 66303277. The reversal of 66303261 is 16230366.

66303261 is a `hidden beast` number, since 6 + 630 + 3 + 26 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 59444100 + 6859161 = 7710^2 + 2619^2 .

It is not a de Polignac number, because 66303261 - 2³ = 66303253 is a prime.

It is a super-2 number, since 2×66303261² = 8792244838468242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66303241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3683506 + ... + 3683523.

Almost surely, 2^66303261 is an apocalyptic number.

It is an amenable number.

66303261 is a deficient number, since it is larger than the sum of its proper divisors (29468129).

66303261 is a wasteful number, since it uses less digits than its factorization.

66303261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367035 (or 7367032 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 66303261 is about 8142.6814379540. The cubic root of 66303261 is about 404.7420213490.

It can be divided in two parts, 66303 and 261, that added together give a square (66564 = 258²).

The spelling of 66303261 in words is "sixty-six million, three hundred three thousand, two hundred sixty-one".