2115564640823 has 2 divisors, whose sum is σ = 2115564640824. Its totient is φ = 2115564640822.

The previous prime is 2115564640817. The next prime is 2115564640831. The reversal of 2115564640823 is 3280464655112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2115564640823 - 2⁴⁰ = 1016053013047 is a prime.

It is a super-2 number, since 2×2115564640823² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115564640873) 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, 1057782320411 + 1057782320412.

It is an arithmetic number, because the mean of its divisors is an integer number (1057782320412).

Almost surely, 2^{2115564640823} is an apocalyptic number.

2115564640823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115564640823 is an equidigital number, since it uses as much as digits as its factorization.

2115564640823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 2115564640823 in words is "two trillion, one hundred fifteen billion, five hundred sixty-four million, six hundred forty thousand, eight hundred twenty-three".