19642708993 has 2 divisors, whose sum is σ = 19642708994. Its totient is φ = 19642708992.

The previous prime is 19642708957. The next prime is 19642709011. The reversal of 19642708993 is 39980724691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11998354369 + 7644354624 = 109537^2 + 87432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19642708993 is a prime.

It is not a weakly prime, because it can be changed into another prime (19642708913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9821354496 + 9821354497.

It is an arithmetic number, because the mean of its divisors is an integer number (9821354497).

Almost surely, 2^19642708993 is an apocalyptic number.

It is an amenable number.

19642708993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19642708993 is an equidigital number, since it uses as much as digits as its factorization.

19642708993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 19642708993 in words is "nineteen billion, six hundred forty-two million, seven hundred eight thousand, nine hundred ninety-three".