19844351959 has 2 divisors, whose sum is σ = 19844351960. Its totient is φ = 19844351958.

The previous prime is 19844351897. The next prime is 19844352007. The reversal of 19844351959 is 95915344891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19844351959 - 2²³ = 19835963351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19844381959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9922175979 + 9922175980.

It is an arithmetic number, because the mean of its divisors is an integer number (9922175980).

Almost surely, 2^19844351959 is an apocalyptic number.

19844351959 is a deficient number, since it is larger than the sum of its proper divisors (1).

19844351959 is an equidigital number, since it uses as much as digits as its factorization.

19844351959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 58.

The spelling of 19844351959 in words is "nineteen billion, eight hundred forty-four million, three hundred fifty-one thousand, nine hundred fifty-nine".