136366561 has 4 divisors (see below), whose sum is σ = 138092800. Its totient is φ = 134640324.

The previous prime is 136366499. The next prime is 136366567. The reversal of 136366561 is 165663631.

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 136366561 - 2¹¹ = 136364513 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 136366561.

It is not an unprimeable number, because it can be changed into a prime (136366567) 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, 863001 + ... + 863158.

It is an arithmetic number, because the mean of its divisors is an integer number (34523200).

Almost surely, 2^136366561 is an apocalyptic number.

It is an amenable number.

136366561 is a deficient number, since it is larger than the sum of its proper divisors (1726239).

136366561 is an equidigital number, since it uses as much as digits as its factorization.

136366561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726238.

The product of its digits is 58320, while the sum is 37.

The square root of 136366561 is about 11677.6093871991. The cubic root of 136366561 is about 514.7179289231.

It can be divided in two parts, 1363665 and 61, that added together give a triangular number (1363726 = T₁₆₅₁).

The spelling of 136366561 in words is "one hundred thirty-six million, three hundred sixty-six thousand, five hundred sixty-one".