136221982785 has 72 divisors (see below), whose sum is σ = 281367404136. Its totient is φ = 60754014720.

The previous prime is 136221982777. The next prime is 136221982789. The reversal of 136221982785 is 587289122631.

136221982785 is a `hidden beast` number, since 1 + 3 + 622 + 1 + 9 + 8 + 2 + 7 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18995179329 + 117226803456 = 137823^2 + 342384^2 .

It is not a de Polignac number, because 136221982785 - 2³ = 136221982777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136221982789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 662994 + ... + 843803.

It is an arithmetic number, because the mean of its divisors is an integer number (3907880613).

Almost surely, 2^136221982785 is an apocalyptic number.

136221982785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

136221982785 is an abundant number, since it is smaller than the sum of its proper divisors (145145421351).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136221982785 is a wasteful number, since it uses less digits than its factorization.

136221982785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506863 (or 1506853 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 136221982785 in words is "one hundred thirty-six billion, two hundred twenty-one million, nine hundred eighty-two thousand, seven hundred eighty-five".