263988667 has 2 divisors, whose sum is σ = 263988668. Its totient is φ = 263988666.

The previous prime is 263988623. The next prime is 263988671. The reversal of 263988667 is 766889362.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263988667 - 2⁷ = 263988539 is a prime.

It is not a weakly prime, because it can be changed into another prime (263988607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131994333 + 131994334.

It is an arithmetic number, because the mean of its divisors is an integer number (131994334).

Almost surely, 2^263988667 is an apocalyptic number.

263988667 is a deficient number, since it is larger than the sum of its proper divisors (1).

263988667 is an equidigital number, since it uses as much as digits as its factorization.

263988667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 55.

The square root of 263988667 is about 16247.7280565622. The cubic root of 263988667 is about 641.4976863257.

The spelling of 263988667 in words is "two hundred sixty-three million, nine hundred eighty-eight thousand, six hundred sixty-seven".