19688938747 has 2 divisors, whose sum is σ = 19688938748. Its totient is φ = 19688938746.

The previous prime is 19688938733. The next prime is 19688938813. The reversal of 19688938747 is 74783988691.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19688938747 is a prime.

It is not a weakly prime, because it can be changed into another prime (19688938447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9844469373 + 9844469374.

It is an arithmetic number, because the mean of its divisors is an integer number (9844469374).

Almost surely, 2^19688938747 is an apocalyptic number.

19688938747 is a deficient number, since it is larger than the sum of its proper divisors (1).

19688938747 is an equidigital number, since it uses as much as digits as its factorization.

19688938747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146313216, while the sum is 70.

The spelling of 19688938747 in words is "nineteen billion, six hundred eighty-eight million, nine hundred thirty-eight thousand, seven hundred forty-seven".