19802535449 has 2 divisors, whose sum is σ = 19802535450. Its totient is φ = 19802535448.

The previous prime is 19802535439. The next prime is 19802535481. The reversal of 19802535449 is 94453520891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15109326400 + 4693209049 = 122920^2 + 68507^2 .

It is a cyclic number.

It is not a de Polignac number, because 19802535449 - 2¹⁶ = 19802469913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19802535397 and 19802535406.

It is not a weakly prime, because it can be changed into another prime (19802535439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9901267724 + 9901267725.

It is an arithmetic number, because the mean of its divisors is an integer number (9901267725).

Almost surely, 2^19802535449 is an apocalyptic number.

It is an amenable number.

19802535449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19802535449 is an equidigital number, since it uses as much as digits as its factorization.

19802535449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 19802535449 in words is "nineteen billion, eight hundred two million, five hundred thirty-five thousand, four hundred forty-nine".