136142605666121 has 4 divisors (see below), whose sum is σ = 136848007768212. Its totient is φ = 135437203564032.

The previous prime is 136142605666117. The next prime is 136142605666141. The reversal of 136142605666121 is 121666506241631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75255625000000 + 60886980666121 = 8675000^2 + 7803011^2 .

It is a cyclic number.

It is not a de Polignac number, because 136142605666121 - 2² = 136142605666117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136142605666121.

It is not an unprimeable number, because it can be changed into a prime (136142605666141) 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, 352701050756 + ... + 352701051141.

It is an arithmetic number, because the mean of its divisors is an integer number (34212001942053).

Almost surely, 2^{136142605666121} is an apocalyptic number.

It is an amenable number.

136142605666121 is a deficient number, since it is larger than the sum of its proper divisors (705402102091).

136142605666121 is an equidigital number, since it uses as much as digits as its factorization.

136142605666121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705402102090.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 136142605666121 in words is "one hundred thirty-six trillion, one hundred forty-two billion, six hundred five million, six hundred sixty-six thousand, one hundred twenty-one".