12640620717436 has 6 divisors (see below), whose sum is σ = 22121086255520. Its totient is φ = 6320310358716.

The previous prime is 12640620717383. The next prime is 12640620717463. The reversal of 12640620717436 is 63471702604621.

It is a self number, because there is not a number n which added to its sum of digits gives 12640620717436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1580077589676 + ... + 1580077589683.

Almost surely, 2^{12640620717436} is an apocalyptic number.

It is an amenable number.

12640620717436 is a deficient number, since it is larger than the sum of its proper divisors (9480465538084).

12640620717436 is a wasteful number, since it uses less digits than its factorization.

12640620717436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160155179363 (or 3160155179361 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 49.

The spelling of 12640620717436 in words is "twelve trillion, six hundred forty billion, six hundred twenty million, seven hundred seventeen thousand, four hundred thirty-six".