12640280042 has 8 divisors (see below), whose sum is σ = 20418913956. Its totient is φ = 5833975392.

The previous prime is 12640280021. The next prime is 12640280053. The reversal of 12640280042 is 24008204621.

12640280042 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 112429²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 12640280041 + 1 = 112429^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12640279987 and 12640280014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243082283 + ... + 243082334.

Almost surely, 2^12640280042 is an apocalyptic number.

12640280042 is a deficient number, since it is larger than the sum of its proper divisors (7778633914).

12640280042 is a wasteful number, since it uses less digits than its factorization.

12640280042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486164632.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 12640280042 its reverse (24008204621), we get a palindrome (36648484663).

The spelling of 12640280042 in words is "twelve billion, six hundred forty million, two hundred eighty thousand, forty-two".