18351685001849 has 2 divisors, whose sum is σ = 18351685001850. Its totient is φ = 18351685001848.

The previous prime is 18351685001833. The next prime is 18351685001927. The reversal of 18351685001849 is 94810058615381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17938951993600 + 412733008249 = 4235440^2 + 642443^2 .

It is a cyclic number.

It is not a de Polignac number, because 18351685001849 - 2⁴ = 18351685001833 is a prime.

It is a super-2 number, since 2×18351685001849² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18351685001809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9175842500924 + 9175842500925.

It is an arithmetic number, because the mean of its divisors is an integer number (9175842500925).

Almost surely, 2^{18351685001849} is an apocalyptic number.

It is an amenable number.

18351685001849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18351685001849 is an equidigital number, since it uses as much as digits as its factorization.

18351685001849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8294400, while the sum is 59.

The spelling of 18351685001849 in words is "eighteen trillion, three hundred fifty-one billion, six hundred eighty-five million, one thousand, eight hundred forty-nine".