19434957673 has 2 divisors, whose sum is σ = 19434957674. Its totient is φ = 19434957672.

The previous prime is 19434957653. The next prime is 19434957797. The reversal of 19434957673 is 37675943491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19196656704 + 238300969 = 138552^2 + 15437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19434957673 is a prime.

It is not a weakly prime, because it can be changed into another prime (19434957653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9717478836 + 9717478837.

It is an arithmetic number, because the mean of its divisors is an integer number (9717478837).

Almost surely, 2^19434957673 is an apocalyptic number.

It is an amenable number.

19434957673 is a deficient number, since it is larger than the sum of its proper divisors (1).

19434957673 is an equidigital number, since it uses as much as digits as its factorization.

19434957673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 58.

The spelling of 19434957673 in words is "nineteen billion, four hundred thirty-four million, nine hundred fifty-seven thousand, six hundred seventy-three".