136856869218 has 20 divisors (see below), whose sum is σ = 306660762870. Its totient is φ = 45618956352.

The previous prime is 136856869199. The next prime is 136856869231. The reversal of 136856869218 is 812968658631.

136856869218 is a `hidden beast` number, since 1 + 3 + 6 + 8 + 568 + 69 + 2 + 1 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 136672914249 + 183954969 = 369693^2 + 13563^2 .

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 422397583 + ... + 422397906.

Almost surely, 2^136856869218 is an apocalyptic number.

136856869218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

136856869218 is an abundant number, since it is smaller than the sum of its proper divisors (169803893652).

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

136856869218 is an equidigital number, since it uses as much as digits as its factorization.

136856869218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844795503 (or 844795494 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The spelling of 136856869218 in words is "one hundred thirty-six billion, eight hundred fifty-six million, eight hundred sixty-nine thousand, two hundred eighteen".