19481516566 has 16 divisors (see below), whose sum is σ = 29438703360. Its totient is φ = 9668716200.

The previous prime is 19481516543. The next prime is 19481516573. The reversal of 19481516566 is 66561518491.

It is a super-2 number, since 2×19481516566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 373885 + ... + 422791.

It is an arithmetic number, because the mean of its divisors is an integer number (1839918960).

Almost surely, 2^19481516566 is an apocalyptic number.

19481516566 is a deficient number, since it is larger than the sum of its proper divisors (9957186794).

19481516566 is a wasteful number, since it uses less digits than its factorization.

19481516566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50379.

The product of its digits is 1555200, while the sum is 52.

The spelling of 19481516566 in words is "nineteen billion, four hundred eighty-one million, five hundred sixteen thousand, five hundred sixty-six".