19813863607 has 2 divisors, whose sum is σ = 19813863608. Its totient is φ = 19813863606.

The previous prime is 19813863593. The next prime is 19813863631. The reversal of 19813863607 is 70636831891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19813863607 is a prime.

It is a super-3 number, since 3×19813863607³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19813863907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9906931803 + 9906931804.

It is an arithmetic number, because the mean of its divisors is an integer number (9906931804).

Almost surely, 2^19813863607 is an apocalyptic number.

19813863607 is a deficient number, since it is larger than the sum of its proper divisors (1).

19813863607 is an equidigital number, since it uses as much as digits as its factorization.

19813863607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 19813863607 in words is "nineteen billion, eight hundred thirteen million, eight hundred sixty-three thousand, six hundred seven".