7826985536621 has 2 divisors, whose sum is σ = 7826985536622. Its totient is φ = 7826985536620.

The previous prime is 7826985536561. The next prime is 7826985536641. The reversal of 7826985536621 is 1266355896287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7066053822025 + 760931714596 = 2658205^2 + 872314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7826985536621 is a prime.

It is a super-2 number, since 2×7826985536621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7826985536641) 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, 3913492768310 + 3913492768311.

It is an arithmetic number, because the mean of its divisors is an integer number (3913492768311).

Almost surely, 2^{7826985536621} is an apocalyptic number.

It is an amenable number.

7826985536621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7826985536621 is an equidigital number, since it uses as much as digits as its factorization.

7826985536621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 261273600, while the sum is 68.

The spelling of 7826985536621 in words is "seven trillion, eight hundred twenty-six billion, nine hundred eighty-five million, five hundred thirty-six thousand, six hundred twenty-one".