8185981605551 has 2 divisors, whose sum is σ = 8185981605552. Its totient is φ = 8185981605550.

The previous prime is 8185981605463. The next prime is 8185981605569. The reversal of 8185981605551 is 1555061895818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8185981605551 - 2¹⁰ = 8185981604527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8185981665551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4092990802775 + 4092990802776.

It is an arithmetic number, because the mean of its divisors is an integer number (4092990802776).

Almost surely, 2^{8185981605551} is an apocalyptic number.

8185981605551 is a deficient number, since it is larger than the sum of its proper divisors (1).

8185981605551 is an equidigital number, since it uses as much as digits as its factorization.

8185981605551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280000, while the sum is 62.

The spelling of 8185981605551 in words is "eight trillion, one hundred eighty-five billion, nine hundred eighty-one million, six hundred five thousand, five hundred fifty-one".