1638898033 has 2 divisors, whose sum is σ = 1638898034. Its totient is φ = 1638898032.

The previous prime is 1638897941. The next prime is 1638898061. The reversal of 1638898033 is 3308988361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 873379809 + 765518224 = 29553^2 + 27668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1638898033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638898133) 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, 819449016 + 819449017.

It is an arithmetic number, because the mean of its divisors is an integer number (819449017).

Almost surely, 2^1638898033 is an apocalyptic number.

It is an amenable number.

1638898033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638898033 is an equidigital number, since it uses as much as digits as its factorization.

1638898033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 1638898033 is about 40483.3056086086. The cubic root of 1638898033 is about 1179.0095185872.

The spelling of 1638898033 in words is "one billion, six hundred thirty-eight million, eight hundred ninety-eight thousand, thirty-three".