136566881 has 4 divisors (see below), whose sum is σ = 148982064. Its totient is φ = 124151700.

The previous prime is 136566869. The next prime is 136566919. The reversal of 136566881 is 188665631.

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 136566881 - 2¹⁰ = 136565857 is a prime.

It is a super-2 number, since 2×136566881² = 37301025972136322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136566181) 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 3 ways as a sum of consecutive naturals, for example, 6207575 + ... + 6207596.

It is an arithmetic number, because the mean of its divisors is an integer number (37245516).

Almost surely, 2^136566881 is an apocalyptic number.

136566881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136566881 is a deficient number, since it is larger than the sum of its proper divisors (12415183).

136566881 is a wasteful number, since it uses less digits than its factorization.

136566881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12415182.

The product of its digits is 207360, while the sum is 44.

The square root of 136566881 is about 11686.1833376000. The cubic root of 136566881 is about 514.9698427058.

The spelling of 136566881 in words is "one hundred thirty-six million, five hundred sixty-six thousand, eight hundred eighty-one".