12135681700 has 18 divisors (see below), whose sum is σ = 26334429506. Its totient is φ = 4854272640.

The previous prime is 12135681697. The next prime is 12135681709. The reversal of 12135681700 is 718653121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 573410916 + 11562270784 = 23946^2 + 107528^2 .

It is not an unprimeable number, because it can be changed into a prime (12135681709) 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 5 ways as a sum of consecutive naturals, for example, 60678309 + ... + 60678508.

Almost surely, 2^12135681700 is an apocalyptic number.

12135681700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12135681700 is an abundant number, since it is smaller than the sum of its proper divisors (14198747806).

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

12135681700 is a wasteful number, since it uses less digits than its factorization.

12135681700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121356831 (or 121356824 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 12135681700 in words is "twelve billion, one hundred thirty-five million, six hundred eighty-one thousand, seven hundred".