19661174834 has 48 divisors (see below), whose sum is σ = 35523382680. Its totient is φ = 8127947520.

The previous prime is 19661174831. The next prime is 19661174851. The reversal of 19661174834 is 43847116691.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19558861609 + 102313225 = 139853^2 + 10115^2 .

It is a super-2 number, since 2×19661174834² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19661174831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3751664 + ... + 3756900.

Almost surely, 2^19661174834 is an apocalyptic number.

19661174834 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19661174834 is a deficient number, since it is larger than the sum of its proper divisors (15862207846).

19661174834 is a wasteful number, since it uses less digits than its factorization.

19661174834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603 (or 6596 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The spelling of 19661174834 in words is "nineteen billion, six hundred sixty-one million, one hundred seventy-four thousand, eight hundred thirty-four".