12703521640 has 72 divisors (see below), whose sum is σ = 29107133010. Its totient is φ = 4989880000.

The previous prime is 12703521629. The next prime is 12703521661. The reversal of 12703521640 is 4612530721.

12703521640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11433169476 + 1270352164 = 106926^2 + 35642^2 .

It is a super-2 number, since 2×12703521640² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 50611515 + ... + 50611765.

Almost surely, 2^12703521640 is an apocalyptic number.

12703521640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12703521640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14553566505).

12703521640 is an abundant number, since it is smaller than the sum of its proper divisors (16403611370).

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

12703521640 is an frugal number, since it uses more digits than its factorization.

12703521640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 12703521640 in words is "twelve billion, seven hundred three million, five hundred twenty-one thousand, six hundred forty".