19475318916 has 45 divisors (see below), whose sum is σ = 50918898261. Its totient is φ = 6490935648.

The previous prime is 19475318911. The next prime is 19475318917. The reversal of 19475318916 is 61981357491.

The square root of 19475318916 is 139554.

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

19475318916 is a `hidden beast` number, since 1 + 94 + 7 + 531 + 8 + 9 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19384992900 + 90326016 = 139230^2 + 9504^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19475318911) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2508096 + ... + 2515848.

Almost surely, 2^19475318916 is an apocalyptic number.

19475318916 is the 139554-th square number.

It is an amenable number.

19475318916 is an abundant number, since it is smaller than the sum of its proper divisors (31443579345).

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

19475318916 is an frugal number, since it uses more digits than its factorization.

19475318916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15522 (or 7758 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The spelling of 19475318916 in words is "nineteen billion, four hundred seventy-five million, three hundred eighteen thousand, nine hundred sixteen".