263690657 has 2 divisors, whose sum is σ = 263690658. Its totient is φ = 263690656.

The previous prime is 263690573. The next prime is 263690659. The reversal of 263690657 is 756096362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260854801 + 2835856 = 16151^2 + 1684^2 .

It is a cyclic number.

It is not a de Polignac number, because 263690657 - 2¹⁰ = 263689633 is a prime.

Together with 263690659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263690659) 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, 131845328 + 131845329.

It is an arithmetic number, because the mean of its divisors is an integer number (131845329).

Almost surely, 2^263690657 is an apocalyptic number.

It is an amenable number.

263690657 is a deficient number, since it is larger than the sum of its proper divisors (1).

263690657 is an equidigital number, since it uses as much as digits as its factorization.

263690657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 263690657 is about 16238.5546462732. The cubic root of 263690657 is about 641.2562053694.

The spelling of 263690657 in words is "two hundred sixty-three million, six hundred ninety thousand, six hundred fifty-seven".