12215702375557 has 4 divisors (see below), whose sum is σ = 12215709379276. Its totient is φ = 12215695371840.

The previous prime is 12215702375497. The next prime is 12215702375623. The reversal of 12215702375557 is 75557320751221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3661428672196 + 8554273703361 = 1913486^2 + 2924769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12215702375557 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 (12215702175557) 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 3 ways as a sum of consecutive naturals, for example, 1424653 + ... + 5144029.

It is an arithmetic number, because the mean of its divisors is an integer number (3053927344819).

Almost surely, 2^{12215702375557} is an apocalyptic number.

It is an amenable number.

12215702375557 is a deficient number, since it is larger than the sum of its proper divisors (7003719).

12215702375557 is an equidigital number, since it uses as much as digits as its factorization.

12215702375557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003718.

The product of its (nonzero) digits is 5145000, while the sum is 52.

The spelling of 12215702375557 in words is "twelve trillion, two hundred fifteen billion, seven hundred two million, three hundred seventy-five thousand, five hundred fifty-seven".