19394461696 has 81 divisors (see below), whose sum is σ = 41204842189. Its totient is φ = 9126805504.

The previous prime is 19394461621. The next prime is 19394461711. The reversal of 19394461696 is 69616449391.

The square root of 19394461696 is 139264.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15099494400 + 4294967296 = 122880^2 + 65536^2 .

It is a super-2 number, since 2×19394461696² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19394461696.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1140850680 + ... + 1140850696.

Almost surely, 2^19394461696 is an apocalyptic number.

19394461696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19394461696 is the 139264-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19394461696

19394461696 is an abundant number, since it is smaller than the sum of its proper divisors (21810380493).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19394461696 is an frugal number, since it uses more digits than its factorization.

19394461696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 19 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 58.

The spelling of 19394461696 in words is "nineteen billion, three hundred ninety-four million, four hundred sixty-one thousand, six hundred ninety-six".