19805001963 has 16 divisors (see below), whose sum is σ = 27133877760. Its totient is φ = 12842301024.

The previous prime is 19805001917. The next prime is 19805001973. The reversal of 19805001963 is 36910050891.

It is not a de Polignac number, because 19805001963 - 2⁹ = 19805001451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19805001973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290356 + ... + 352017.

It is an arithmetic number, because the mean of its divisors is an integer number (1695867360).

Almost surely, 2^19805001963 is an apocalyptic number.

19805001963 is a deficient number, since it is larger than the sum of its proper divisors (7328875797).

19805001963 is a wasteful number, since it uses less digits than its factorization.

19805001963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642658.

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 19805001963 in words is "nineteen billion, eight hundred five million, one thousand, nine hundred sixty-three".