136606361261 has 4 divisors (see below), whose sum is σ = 136607129724. Its totient is φ = 136605592800.

The previous prime is 136606361237. The next prime is 136606361263. The reversal of 136606361261 is 162163606631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 162163606631 = 13 ⋅12474123587.

It can be written as a sum of positive squares in 2 ways, for example, as 3832848100 + 132773513161 = 61910^2 + 364381^2 .

It is a cyclic number.

It is not a de Polignac number, because 136606361261 - 2⁶ = 136606361197 is a prime.

It is a super-2 number, since 2×136606361261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136606361263) 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, 34601 + ... + 523841.

It is an arithmetic number, because the mean of its divisors is an integer number (34151782431).

Almost surely, 2^136606361261 is an apocalyptic number.

It is an amenable number.

136606361261 is a deficient number, since it is larger than the sum of its proper divisors (768463).

136606361261 is an equidigital number, since it uses as much as digits as its factorization.

136606361261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768462.

The product of its (nonzero) digits is 139968, while the sum is 41.

Adding to 136606361261 its reverse (162163606631), we get a palindrome (298769967892).

The spelling of 136606361261 in words is "one hundred thirty-six billion, six hundred six million, three hundred sixty-one thousand, two hundred sixty-one".