18281961750511 has 2 divisors, whose sum is σ = 18281961750512. Its totient is φ = 18281961750510.

The previous prime is 18281961750487. The next prime is 18281961750581. The reversal of 18281961750511 is 11505716918281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18281961750511 - 2²⁵ = 18281928196079 is a prime.

It is a super-2 number, since 2×18281961750511² (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 (18281961750581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9140980875255 + 9140980875256.

It is an arithmetic number, because the mean of its divisors is an integer number (9140980875256).

Almost surely, 2^{18281961750511} is an apocalyptic number.

18281961750511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18281961750511 is an equidigital number, since it uses as much as digits as its factorization.

18281961750511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 55.

The spelling of 18281961750511 in words is "eighteen trillion, two hundred eighty-one billion, nine hundred sixty-one million, seven hundred fifty thousand, five hundred eleven".