19305990916 has 9 divisors (see below), whose sum is σ = 33785970421. Its totient is φ = 9652856512.

The previous prime is 19305990883. The next prime is 19305990923. The reversal of 19305990916 is 61909950391.

The square root of 19305990916 is 138946.

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., 11043908100 + 8262082816 = 105090^2 + 90896^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 243156 + ... + 312628.

Almost surely, 2^19305990916 is an apocalyptic number.

19305990916 is the 138946-th square number.

It is an amenable number.

19305990916 is a deficient number, since it is larger than the sum of its proper divisors (14479979505).

19305990916 is an frugal number, since it uses more digits than its factorization.

19305990916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138950 (or 69475 counting only the distinct ones).

The product of its (nonzero) digits is 590490, while the sum is 52.

The spelling of 19305990916 in words is "nineteen billion, three hundred five million, nine hundred ninety thousand, nine hundred sixteen".