19713634387 has 2 divisors, whose sum is σ = 19713634388. Its totient is φ = 19713634386.

The previous prime is 19713634337. The next prime is 19713634453. The reversal of 19713634387 is 78343631791.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19713634387 is a prime.

It is not a weakly prime, because it can be changed into another prime (19713634307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9856817193 + 9856817194.

It is an arithmetic number, because the mean of its divisors is an integer number (9856817194).

Almost surely, 2^19713634387 is an apocalyptic number.

19713634387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19713634387 is an equidigital number, since it uses as much as digits as its factorization.

19713634387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 52.

The spelling of 19713634387 in words is "nineteen billion, seven hundred thirteen million, six hundred thirty-four thousand, three hundred eighty-seven".