8201599282781 has 2 divisors, whose sum is σ = 8201599282782. Its totient is φ = 8201599282780.

The previous prime is 8201599282699. The next prime is 8201599282813. The reversal of 8201599282781 is 1872829951028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5165847122500 + 3035752160281 = 2272850^2 + 1742341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8201599282781 is a prime.

It is a super-2 number, since 2×8201599282781² (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 (8201592282781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100799641390 + 4100799641391.

It is an arithmetic number, because the mean of its divisors is an integer number (4100799641391).

Almost surely, 2^{8201599282781} is an apocalyptic number.

It is an amenable number.

8201599282781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8201599282781 is an equidigital number, since it uses as much as digits as its factorization.

8201599282781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11612160, while the sum is 62.

The spelling of 8201599282781 in words is "eight trillion, two hundred one billion, five hundred ninety-nine million, two hundred eighty-two thousand, seven hundred eighty-one".