19663050625 has 45 divisors (see below), whose sum is σ = 25241352213. Its totient is φ = 15312570000.

The previous prime is 19663050623. The next prime is 19663050643. The reversal of 19663050625 is 52605036691.

The square root of 19663050625 is 140225.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1541583169 + 18121467456 = 39263^2 + 134616^2 .

It is not a de Polignac number, because 19663050625 - 2¹ = 19663050623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19663050623) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 248899336 + ... + 248899414.

Almost surely, 2^19663050625 is an apocalyptic number.

19663050625 is the 140225-th square number.

19663050625 is the 70113-rd centered octagonal number.

It is an amenable number.

19663050625 is a deficient number, since it is larger than the sum of its proper divisors (5578301588).

19663050625 is an frugal number, since it uses more digits than its factorization.

19663050625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 19663050625 in words is "nineteen billion, six hundred sixty-three million, fifty thousand, six hundred twenty-five".