12664550123615 has 16 divisors (see below), whose sum is σ = 16395259204800. Its totient is φ = 9335846790912.

The previous prime is 12664550123567. The next prime is 12664550123623. The reversal of 12664550123615 is 51632105546621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12664550123615 - 2⁶ = 12664550123551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12664550123615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171174995 + ... + 171248964.

It is an arithmetic number, because the mean of its divisors is an integer number (1024703700300).

Almost surely, 2^{12664550123615} is an apocalyptic number.

12664550123615 is a deficient number, since it is larger than the sum of its proper divisors (3730709081185).

12664550123615 is a wasteful number, since it uses less digits than its factorization.

12664550123615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342424546.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 12664550123615 in words is "twelve trillion, six hundred sixty-four billion, five hundred fifty million, one hundred twenty-three thousand, six hundred fifteen".