2315718856621 has 2 divisors, whose sum is σ = 2315718856622. Its totient is φ = 2315718856620.

The previous prime is 2315718856567. The next prime is 2315718856669. The reversal of 2315718856621 is 1266588175132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1174644116100 + 1141074740521 = 1083810^2 + 1068211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2315718856621 - 2⁹ = 2315718856109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2315718866621) 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 as a sum of consecutive naturals, namely, 1157859428310 + 1157859428311.

It is an arithmetic number, because the mean of its divisors is an integer number (1157859428311).

Almost surely, 2^{2315718856621} is an apocalyptic number.

It is an amenable number.

2315718856621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2315718856621 is an equidigital number, since it uses as much as digits as its factorization.

2315718856621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4838400, while the sum is 55.

The spelling of 2315718856621 in words is "two trillion, three hundred fifteen billion, seven hundred eighteen million, eight hundred fifty-six thousand, six hundred twenty-one".