268136281609 has 4 divisors (see below), whose sum is σ = 306441464704. Its totient is φ = 229831098516.

The previous prime is 268136281579. The next prime is 268136281627. The reversal of 268136281609 is 906182631862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 268136281609 - 2¹¹ = 268136279561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268136281109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19152591537 + ... + 19152591550.

It is an arithmetic number, because the mean of its divisors is an integer number (76610366176).

Almost surely, 2^268136281609 is an apocalyptic number.

It is an amenable number.

268136281609 is a deficient number, since it is larger than the sum of its proper divisors (38305183095).

268136281609 is an equidigital number, since it uses as much as digits as its factorization.

268136281609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38305183094.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 268136281609 in words is "two hundred sixty-eight billion, one hundred thirty-six million, two hundred eighty-one thousand, six hundred nine".