451666261 has 2 divisors, whose sum is σ = 451666262. Its totient is φ = 451666260.

The previous prime is 451666253. The next prime is 451666273. The reversal of 451666261 is 162666154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449185636 + 2480625 = 21194^2 + 1575^2 .

It is a cyclic number.

It is not a de Polignac number, because 451666261 - 2³ = 451666253 is a prime.

It is a super-2 number, since 2×451666261² = 408004822651440242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 451666261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451666211) 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 as a sum of consecutive naturals, namely, 225833130 + 225833131.

It is an arithmetic number, because the mean of its divisors is an integer number (225833131).

Almost surely, 2^451666261 is an apocalyptic number.

It is an amenable number.

451666261 is a deficient number, since it is larger than the sum of its proper divisors (1).

451666261 is an equidigital number, since it uses as much as digits as its factorization.

451666261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 451666261 is about 21252.4412950607. The cubic root of 451666261 is about 767.2540981374.

The spelling of 451666261 in words is "four hundred fifty-one million, six hundred sixty-six thousand, two hundred sixty-one".