663367261 has 2 divisors, whose sum is σ = 663367262. Its totient is φ = 663367260.

The previous prime is 663367247. The next prime is 663367297. The reversal of 663367261 is 162763366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591219225 + 72148036 = 24315^2 + 8494^2 .

It is a cyclic number.

It is not a de Polignac number, because 663367261 - 2¹⁵ = 663334493 is a prime.

It is a super-2 number, since 2×663367261² = 880112245933284242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663367241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331683630 + 331683631.

It is an arithmetic number, because the mean of its divisors is an integer number (331683631).

Almost surely, 2^663367261 is an apocalyptic number.

It is an amenable number.

663367261 is a deficient number, since it is larger than the sum of its proper divisors (1).

663367261 is an equidigital number, since it uses as much as digits as its factorization.

663367261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 40.

The square root of 663367261 is about 25755.9170094951. The cubic root of 663367261 is about 872.1369325438.

The spelling of 663367261 in words is "six hundred sixty-three million, three hundred sixty-seven thousand, two hundred sixty-one".