19489276816 has 45 divisors (see below), whose sum is σ = 40131885171. Its totient is φ = 9166957056.

The previous prime is 19489276811. The next prime is 19489276823. The reversal of 19489276816 is 61867298491.

The square root of 19489276816 is 139604.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1832182416 + 17657094400 = 42804^2 + 132880^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19489276811) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9492046 + ... + 9494098.

Almost surely, 2^19489276816 is an apocalyptic number.

19489276816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19489276816 is the 139604-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19489276816

19489276816 is an abundant number, since it is smaller than the sum of its proper divisors (20642608355).

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

19489276816 is an frugal number, since it uses more digits than its factorization.

19489276816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 2072 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 61.

The spelling of 19489276816 in words is "nineteen billion, four hundred eighty-nine million, two hundred seventy-six thousand, eight hundred sixteen".