19995578063 has 2 divisors, whose sum is σ = 19995578064. Its totient is φ = 19995578062.

The previous prime is 19995578059. The next prime is 19995578111. The reversal of 19995578063 is 36087559991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19995578063 - 2² = 19995578059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19995577987 and 19995578005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19995578033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997789031 + 9997789032.

It is an arithmetic number, because the mean of its divisors is an integer number (9997789032).

Almost surely, 2^19995578063 is an apocalyptic number.

19995578063 is a deficient number, since it is larger than the sum of its proper divisors (1).

19995578063 is an equidigital number, since it uses as much as digits as its factorization.

19995578063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18370800, while the sum is 62.

The spelling of 19995578063 in words is "nineteen billion, nine hundred ninety-five million, five hundred seventy-eight thousand, sixty-three".