136666537 has 12 divisors (see below), whose sum is σ = 159569220. Its totient is φ = 116708256.

The previous prime is 136666471. The next prime is 136666547. The reversal of 136666537 is 735666631.

It can be written as a sum of positive squares in 2 ways, for example, as 28901376 + 107765161 = 5376^2 + 10381^2 .

It is a de Polignac number, because none of the positive numbers 2^k-136666537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136666493 and 136666502.

It is not an unprimeable number, because it can be changed into a prime (136666547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8539 + ... + 18607.

It is an arithmetic number, because the mean of its divisors is an integer number (13297435).

Almost surely, 2^136666537 is an apocalyptic number.

It is an amenable number.

136666537 is a deficient number, since it is larger than the sum of its proper divisors (22902683).

136666537 is a wasteful number, since it uses less digits than its factorization.

136666537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10360 (or 10353 counting only the distinct ones).

The product of its digits is 408240, while the sum is 43.

The square root of 136666537 is about 11690.4463986625. The cubic root of 136666537 is about 515.0950740362.

The spelling of 136666537 in words is "one hundred thirty-six million, six hundred sixty-six thousand, five hundred thirty-seven".