268515761 has 2 divisors, whose sum is σ = 268515762. Its totient is φ = 268515760.

The previous prime is 268515739. The next prime is 268515763. The reversal of 268515761 is 167515862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265690000 + 2825761 = 16300^2 + 1681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268515761 is a prime.

Together with 268515763, 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 (268515763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134257880 + 134257881.

It is an arithmetic number, because the mean of its divisors is an integer number (134257881).

Almost surely, 2^268515761 is an apocalyptic number.

It is an amenable number.

268515761 is a deficient number, since it is larger than the sum of its proper divisors (1).

268515761 is an equidigital number, since it uses as much as digits as its factorization.

268515761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 268515761 is about 16386.4505308502. The cubic root of 268515761 is about 645.1438983470.

The spelling of 268515761 in words is "two hundred sixty-eight million, five hundred fifteen thousand, seven hundred sixty-one".