136661643 has 6 divisors (see below), whose sum is σ = 197400164. Its totient is φ = 91107756.

The previous prime is 136661633. The next prime is 136661663. The reversal of 136661643 is 346166631.

It is not a de Polignac number, because 136661643 - 2⁴ = 136661627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136661598 and 136661607.

It is not an unprimeable number, because it can be changed into a prime (136661633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7592305 + ... + 7592322.

Almost surely, 2^136661643 is an apocalyptic number.

136661643 is a deficient number, since it is larger than the sum of its proper divisors (60738521).

136661643 is a wasteful number, since it uses less digits than its factorization.

136661643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15184633 (or 15184630 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 136661643 is about 11690.2370805728. The cubic root of 136661643 is about 515.0889254807.

The spelling of 136661643 in words is "one hundred thirty-six million, six hundred sixty-one thousand, six hundred forty-three".