12281873378 has 4 divisors (see below), whose sum is σ = 18422810070. Its totient is φ = 6140936688.

The previous prime is 12281873377. The next prime is 12281873411. The reversal of 12281873378 is 87337818221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87337818221 = 281 ⋅310810741.

It can be written as a sum of positive squares in only one way, i.e., 11377848889 + 904024489 = 106667^2 + 30067^2 .

It is not an unprimeable number, because it can be changed into a prime (12281873377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3070468343 + ... + 3070468346.

Almost surely, 2^12281873378 is an apocalyptic number.

12281873378 is a deficient number, since it is larger than the sum of its proper divisors (6140936692).

12281873378 is an equidigital number, since it uses as much as digits as its factorization.

12281873378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140936691.

The product of its digits is 903168, while the sum is 50.

The spelling of 12281873378 in words is "twelve billion, two hundred eighty-one million, eight hundred seventy-three thousand, three hundred seventy-eight".