12381720552 has 48 divisors (see below), whose sum is σ = 34440153540. Its totient is φ = 4015692288.

The previous prime is 12381720539. The next prime is 12381720553. The reversal of 12381720552 is 25502718321.

12381720552 is a `hidden beast` number, since 1 + 2 + 3 + 81 + 7 + 20 + 552 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10988490276 + 1393230276 = 104826^2 + 37326^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12381720553) 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, 2321233 + ... + 2326560.

Almost surely, 2^12381720552 is an apocalyptic number.

12381720552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12381720552 is an abundant number, since it is smaller than the sum of its proper divisors (22058432988).

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

12381720552 is a wasteful number, since it uses less digits than its factorization.

12381720552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647842 (or 4647835 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 12381720552 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty thousand, five hundred fifty-two".