12435342778 has 4 divisors (see below), whose sum is σ = 18653014170. Its totient is φ = 6217671388.

The previous prime is 12435342761. The next prime is 12435342779. The reversal of 12435342778 is 87724353421.

12435342778 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87724353421 = 168677 ⋅520073.

It can be written as a sum of positive squares in only one way, i.e., 12023780409 + 411562369 = 109653^2 + 20287^2 .

It is not an unprimeable number, because it can be changed into a prime (12435342779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3108835693 + ... + 3108835696.

Almost surely, 2^12435342778 is an apocalyptic number.

12435342778 is a deficient number, since it is larger than the sum of its proper divisors (6217671392).

12435342778 is an equidigital number, since it uses as much as digits as its factorization.

12435342778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6217671391.

The product of its digits is 1128960, while the sum is 46.

The spelling of 12435342778 in words is "twelve billion, four hundred thirty-five million, three hundred forty-two thousand, seven hundred seventy-eight".