19992827857 has 2 divisors, whose sum is σ = 19992827858. Its totient is φ = 19992827856.

The previous prime is 19992827831. The next prime is 19992827873. The reversal of 19992827857 is 75872829991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13411724481 + 6581103376 = 115809^2 + 81124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19992827857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19992827792 and 19992827801.

It is not a weakly prime, because it can be changed into another prime (19992827357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996413928 + 9996413929.

It is an arithmetic number, because the mean of its divisors is an integer number (9996413929).

Almost surely, 2^19992827857 is an apocalyptic number.

It is an amenable number.

19992827857 is a deficient number, since it is larger than the sum of its proper divisors (1).

19992827857 is an equidigital number, since it uses as much as digits as its factorization.

19992827857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45722880, while the sum is 67.

The spelling of 19992827857 in words is "nineteen billion, nine hundred ninety-two million, eight hundred twenty-seven thousand, eight hundred fifty-seven".