18426849949 has 2 divisors, whose sum is σ = 18426849950. Its totient is φ = 18426849948.

The previous prime is 18426849929. The next prime is 18426849977. The reversal of 18426849949 is 94994862481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16404998724 + 2021851225 = 128082^2 + 44965^2 .

It is a cyclic number.

It is not a de Polignac number, because 18426849949 - 2⁹ = 18426849437 is a prime.

It is a super-2 number, since 2×18426849949² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18426849929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9213424974 + 9213424975.

It is an arithmetic number, because the mean of its divisors is an integer number (9213424975).

Almost surely, 2^18426849949 is an apocalyptic number.

It is an amenable number.

18426849949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18426849949 is an equidigital number, since it uses as much as digits as its factorization.

18426849949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35831808, while the sum is 64.

The spelling of 18426849949 in words is "eighteen billion, four hundred twenty-six million, eight hundred forty-nine thousand, nine hundred forty-nine".