136661861268 has 36 divisors (see below), whose sum is σ = 345551058580. Its totient is φ = 45540734976.

The previous prime is 136661861263. The next prime is 136661861321. The reversal of 136661861268 is 862168166631.

It can be written as a sum of positive squares in 2 ways, for example, as 66372186384 + 70289674884 = 257628^2 + 265122^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136661861263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424603 + ... + 673506.

Almost surely, 2^136661861268 is an apocalyptic number.

136661861268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

136661861268 is an abundant number, since it is smaller than the sum of its proper divisors (208889197312).

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

136661861268 is a wasteful number, since it uses less digits than its factorization.

136661861268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101576 (or 1101571 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The spelling of 136661861268 in words is "one hundred thirty-six billion, six hundred sixty-one million, eight hundred sixty-one thousand, two hundred sixty-eight".