19838872849 has 2 divisors, whose sum is σ = 19838872850. Its totient is φ = 19838872848.

The previous prime is 19838872829. The next prime is 19838872877. The reversal of 19838872849 is 94827883891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19716372225 + 122500624 = 140415^2 + 11068^2 .

It is a cyclic number.

It is not a de Polignac number, because 19838872849 - 2¹⁹ = 19838348561 is a prime.

It is not a weakly prime, because it can be changed into another prime (19838872829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9919436424 + 9919436425.

It is an arithmetic number, because the mean of its divisors is an integer number (9919436425).

Almost surely, 2^19838872849 is an apocalyptic number.

It is an amenable number.

19838872849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19838872849 is an equidigital number, since it uses as much as digits as its factorization.

19838872849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55738368, while the sum is 67.

The spelling of 19838872849 in words is "nineteen billion, eight hundred thirty-eight million, eight hundred seventy-two thousand, eight hundred forty-nine".