18581725306783 has 2 divisors, whose sum is σ = 18581725306784. Its totient is φ = 18581725306782.

The previous prime is 18581725306691. The next prime is 18581725306787. The reversal of 18581725306783 is 38760352718581.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18581725306783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18581725306787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9290862653391 + 9290862653392.

It is an arithmetic number, because the mean of its divisors is an integer number (9290862653392).

Almost surely, 2^{18581725306783} is an apocalyptic number.

18581725306783 is a deficient number, since it is larger than the sum of its proper divisors (1).

18581725306783 is an equidigital number, since it uses as much as digits as its factorization.

18581725306783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67737600, while the sum is 64.

The spelling of 18581725306783 in words is "eighteen trillion, five hundred eighty-one billion, seven hundred twenty-five million, three hundred six thousand, seven hundred eighty-three".