12356551380 has 96 divisors (see below), whose sum is σ = 35931861504. Its totient is φ = 3170369664.

The previous prime is 12356551343. The next prime is 12356551381. The reversal of 12356551380 is 8315565321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12356551381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137119 + ... + 208601.

It is an arithmetic number, because the mean of its divisors is an integer number (374290224).

Almost surely, 2^12356551380 is an apocalyptic number.

12356551380 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 12356551380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17965930752).

12356551380 is an abundant number, since it is smaller than the sum of its proper divisors (23575310124).

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

12356551380 is a wasteful number, since it uses less digits than its factorization.

12356551380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71605 (or 71603 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 12356551380 in words is "twelve billion, three hundred fifty-six million, five hundred fifty-one thousand, three hundred eighty".