12657664542 has 16 divisors (see below), whose sum is σ = 25379100432. Its totient is φ = 4208592960.

The previous prime is 12657664531. The next prime is 12657664559. The reversal of 12657664542 is 24546675621.

12657664542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12657664491 and 12657664500.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 2654559 + ... + 2659322.

It is an arithmetic number, because the mean of its divisors is an integer number (1586193777).

Almost surely, 2^12657664542 is an apocalyptic number.

12657664542 is an abundant number, since it is smaller than the sum of its proper divisors (12721435890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12657664542 is a wasteful number, since it uses less digits than its factorization.

12657664542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5314283.

The product of its digits is 2419200, while the sum is 48.

The spelling of 12657664542 in words is "twelve billion, six hundred fifty-seven million, six hundred sixty-four thousand, five hundred forty-two".