12378561552 has 120 divisors (see below), whose sum is σ = 40262988480. Its totient is φ = 3476770560.

The previous prime is 12378561523. The next prime is 12378561553. The reversal of 12378561552 is 25516587321.

12378561552 is a `hidden beast` number, since 1 + 2 + 37 + 8 + 5 + 61 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12378561498 and 12378561507.

It is not an unprimeable number, because it can be changed into a prime (12378561553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44599 + ... + 163542.

It is an arithmetic number, because the mean of its divisors is an integer number (335524904).

Almost surely, 2^12378561552 is an apocalyptic number.

12378561552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12378561552 is an abundant number, since it is smaller than the sum of its proper divisors (27884426928).

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

12378561552 is a wasteful number, since it uses less digits than its factorization.

12378561552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208221 (or 208212 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The spelling of 12378561552 in words is "twelve billion, three hundred seventy-eight million, five hundred sixty-one thousand, five hundred fifty-two".