136521665566 has 16 divisors (see below), whose sum is σ = 240583634928. Its totient is φ = 57281817600.

The previous prime is 136521665563. The next prime is 136521665591. The reversal of 136521665566 is 665566125631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136521665563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238673955 + ... + 238674526.

It is an arithmetic number, because the mean of its divisors is an integer number (15036477183).

Almost surely, 2^136521665566 is an apocalyptic number.

136521665566 is a deficient number, since it is larger than the sum of its proper divisors (104061969362).

136521665566 is a wasteful number, since it uses less digits than its factorization.

136521665566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477348507.

The product of its digits is 5832000, while the sum is 52.

The spelling of 136521665566 in words is "one hundred thirty-six billion, five hundred twenty-one million, six hundred sixty-five thousand, five hundred sixty-six".