136363308581 has 4 divisors (see below), whose sum is σ = 144384679692. Its totient is φ = 128341937472.

The previous prime is 136363308469. The next prime is 136363308589. The reversal of 136363308581 is 185803363631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185803363631 = 29 ⋅6407012539.

It can be written as a sum of positive squares in 2 ways, for example, as 76272630625 + 60090677956 = 276175^2 + 245134^2 .

It is a cyclic number.

It is not a de Polignac number, because 136363308581 - 2¹⁸ = 136363046437 is a prime.

It is a super-2 number, since 2×136363308581² (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 (136363308589) 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, 4010685530 + ... + 4010685563.

It is an arithmetic number, because the mean of its divisors is an integer number (36096169923).

Almost surely, 2^136363308581 is an apocalyptic number.

It is an amenable number.

136363308581 is a deficient number, since it is larger than the sum of its proper divisors (8021371111).

136363308581 is an equidigital number, since it uses as much as digits as its factorization.

136363308581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8021371110.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 136363308581 in words is "one hundred thirty-six billion, three hundred sixty-three million, three hundred eight thousand, five hundred eighty-one".