12640547042 has 8 divisors (see below), whose sum is σ = 19572460032. Its totient is φ = 6116393700.

The previous prime is 12640547009. The next prime is 12640547071. The reversal of 12640547042 is 24074504621.

It is a happy number.

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 = 12640546993 and 12640547011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101939834 + ... + 101939957.

It is an arithmetic number, because the mean of its divisors is an integer number (2446557504).

Almost surely, 2^12640547042 is an apocalyptic number.

12640547042 is a deficient number, since it is larger than the sum of its proper divisors (6931912990).

12640547042 is a wasteful number, since it uses less digits than its factorization.

12640547042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203879824.

The product of its (nonzero) digits is 53760, while the sum is 35.

The spelling of 12640547042 in words is "twelve billion, six hundred forty million, five hundred forty-seven thousand, forty-two".