12381720478 has 32 divisors (see below), whose sum is σ = 19718811648. Its totient is φ = 5820660000.

The previous prime is 12381720473. The next prime is 12381720493. The reversal of 12381720478 is 87402718321.

It is a super-3 number, since 3×12381720478³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381720473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1719201 + ... + 1726387.

It is an arithmetic number, because the mean of its divisors is an integer number (616212864).

Almost surely, 2^12381720478 is an apocalyptic number.

12381720478 is a deficient number, since it is larger than the sum of its proper divisors (7337091170).

12381720478 is a wasteful number, since it uses less digits than its factorization.

12381720478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 12381720478 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty thousand, four hundred seventy-eight".