18081629849 has 2 divisors, whose sum is σ = 18081629850. Its totient is φ = 18081629848.

The previous prime is 18081629803. The next prime is 18081629861. The reversal of 18081629849 is 94892618081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15784153225 + 2297476624 = 125635^2 + 47932^2 .

It is a cyclic number.

It is not a de Polignac number, because 18081629849 - 2¹⁶ = 18081564313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18081629794 and 18081629803.

It is not a weakly prime, because it can be changed into another prime (18081629899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9040814924 + 9040814925.

It is an arithmetic number, because the mean of its divisors is an integer number (9040814925).

Almost surely, 2^18081629849 is an apocalyptic number.

It is an amenable number.

18081629849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18081629849 is an equidigital number, since it uses as much as digits as its factorization.

18081629849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 56.

The spelling of 18081629849 in words is "eighteen billion, eighty-one million, six hundred twenty-nine thousand, eight hundred forty-nine".