666314261 has 2 divisors, whose sum is σ = 666314262. Its totient is φ = 666314260.

The previous prime is 666314239. The next prime is 666314267. The reversal of 666314261 is 162413666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662290225 + 4024036 = 25735^2 + 2006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666314261 is a prime.

It is a super-2 number, since 2×666314261² = 887949388823952242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666314267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333157130 + 333157131.

It is an arithmetic number, because the mean of its divisors is an integer number (333157131).

Almost surely, 2^666314261 is an apocalyptic number.

It is an amenable number.

666314261 is a deficient number, since it is larger than the sum of its proper divisors (1).

666314261 is an equidigital number, since it uses as much as digits as its factorization.

666314261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 666314261 is about 25813.0637662405. The cubic root of 666314261 is about 873.4265102529.

The spelling of 666314261 in words is "six hundred sixty-six million, three hundred fourteen thousand, two hundred sixty-one".