19875640313 has 2 divisors, whose sum is σ = 19875640314. Its totient is φ = 19875640312.

The previous prime is 19875640247. The next prime is 19875640333. The reversal of 19875640313 is 31304657891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14380086889 + 5495553424 = 119917^2 + 74132^2 .

It is a cyclic number.

It is not a de Polignac number, because 19875640313 - 2²⁸ = 19607204857 is a prime.

It is not a weakly prime, because it can be changed into another prime (19875640333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9937820156 + 9937820157.

It is an arithmetic number, because the mean of its divisors is an integer number (9937820157).

Almost surely, 2^19875640313 is an apocalyptic number.

It is an amenable number.

19875640313 is a deficient number, since it is larger than the sum of its proper divisors (1).

19875640313 is an equidigital number, since it uses as much as digits as its factorization.

19875640313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 19875640313 in words is "nineteen billion, eight hundred seventy-five million, six hundred forty thousand, three hundred thirteen".