19556023313 has 2 divisors, whose sum is σ = 19556023314. Its totient is φ = 19556023312.

The previous prime is 19556023261. The next prime is 19556023349. The reversal of 19556023313 is 31332065591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19525031824 + 30991489 = 139732^2 + 5567^2 .

It is an emirp because it is prime and its reverse (31332065591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19556023313 is a prime.

It is not a weakly prime, because it can be changed into another prime (19556023373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9778011656 + 9778011657.

It is an arithmetic number, because the mean of its divisors is an integer number (9778011657).

Almost surely, 2^19556023313 is an apocalyptic number.

It is an amenable number.

19556023313 is a deficient number, since it is larger than the sum of its proper divisors (1).

19556023313 is an equidigital number, since it uses as much as digits as its factorization.

19556023313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 38.

The spelling of 19556023313 in words is "nineteen billion, five hundred fifty-six million, twenty-three thousand, three hundred thirteen".