12646221551357 has 4 divisors (see below), whose sum is σ = 12651178912416. Its totient is φ = 12641264190300.

The previous prime is 12646221551281. The next prime is 12646221551363. The reversal of 12646221551357 is 75315512264621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12646221551357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12646221557357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478676703 + ... + 2478681804.

It is an arithmetic number, because the mean of its divisors is an integer number (3162794728104).

Almost surely, 2^{12646221551357} is an apocalyptic number.

It is an amenable number.

12646221551357 is a deficient number, since it is larger than the sum of its proper divisors (4957361059).

12646221551357 is an equidigital number, since it uses as much as digits as its factorization.

12646221551357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4957361058.

The product of its digits is 3024000, while the sum is 50.

The spelling of 12646221551357 in words is "twelve trillion, six hundred forty-six billion, two hundred twenty-one million, five hundred fifty-one thousand, three hundred fifty-seven".