12650656646 has 16 divisors (see below), whose sum is σ = 20064307200. Its totient is φ = 5965540488.

The previous prime is 12650656637. The next prime is 12650656649. The reversal of 12650656646 is 64665605621.

It is a super-2 number, since 2×12650656646² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12650656646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12650656649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737966 + ... + 754913.

It is an arithmetic number, because the mean of its divisors is an integer number (1254019200).

Almost surely, 2^12650656646 is an apocalyptic number.

12650656646 is a deficient number, since it is larger than the sum of its proper divisors (7413650554).

12650656646 is a wasteful number, since it uses less digits than its factorization.

12650656646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493123.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 12650656646 in words is "twelve billion, six hundred fifty million, six hundred fifty-six thousand, six hundred forty-six".