268837661 has 2 divisors, whose sum is σ = 268837662. Its totient is φ = 268837660.

The previous prime is 268837577. The next prime is 268837687. The reversal of 268837661 is 166738862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263575225 + 5262436 = 16235^2 + 2294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268837661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268837561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134418830 + 134418831.

It is an arithmetic number, because the mean of its divisors is an integer number (134418831).

Almost surely, 2^268837661 is an apocalyptic number.

It is an amenable number.

268837661 is a deficient number, since it is larger than the sum of its proper divisors (1).

268837661 is an equidigital number, since it uses as much as digits as its factorization.

268837661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 268837661 is about 16396.2697282034. The cubic root of 268837661 is about 645.4015975461.

The spelling of 268837661 in words is "two hundred sixty-eight million, eight hundred thirty-seven thousand, six hundred sixty-one".