12650656638 has 32 divisors (see below), whose sum is σ = 26316905472. Its totient is φ = 4049697600.

The previous prime is 12650656637. The next prime is 12650656649. The reversal of 12650656638 is 83665605621.

It is a super-2 number, since 2×12650656638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12650656637) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 235231 + ... + 283962.

It is an arithmetic number, because the mean of its divisors is an integer number (822403296).

Almost surely, 2^12650656638 is an apocalyptic number.

12650656638 is an abundant number, since it is smaller than the sum of its proper divisors (13666248834).

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

12650656638 is a wasteful number, since it uses less digits than its factorization.

12650656638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519360.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 12650656638 in words is "twelve billion, six hundred fifty million, six hundred fifty-six thousand, six hundred thirty-eight".