19630440819 has 24 divisors (see below), whose sum is σ = 30974121984. Its totient is φ = 11881350000.

The previous prime is 19630440811. The next prime is 19630440853. The reversal of 19630440819 is 91804403691.

19630440819 is a `hidden beast` number, since 1 + 9 + 630 + 4 + 4 + 0 + 8 + 1 + 9 = 666.

It is not a de Polignac number, because 19630440819 - 2³ = 19630440811 is a prime.

It is a super-2 number, since 2×19630440819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19630440811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57667 + ... + 206364.

It is an arithmetic number, because the mean of its divisors is an integer number (1290588416).

Almost surely, 2^19630440819 is an apocalyptic number.

19630440819 is a deficient number, since it is larger than the sum of its proper divisors (11343681165).

19630440819 is a wasteful number, since it uses less digits than its factorization.

19630440819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264799 (or 264796 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 19630440819 in words is "nineteen billion, six hundred thirty million, four hundred forty thousand, eight hundred nineteen".