19225763649 has 9 divisors (see below), whose sum is σ = 27771148353. Its totient is φ = 12816898452.

The previous prime is 19225763639. The next prime is 19225763671. The reversal of 19225763649 is 94636752291.

The square root of 19225763649 is 138657.

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

19225763649 is a `hidden beast` number, since 1 + 9 + 2 + 2 + 576 + 3 + 64 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-19225763649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19225763595 and 19225763604.

It is not an unprimeable number, because it can be changed into a prime (19225763639) 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, 392862 + ... + 439080.

Almost surely, 2^19225763649 is an apocalyptic number.

19225763649 is the 138657-th square number.

19225763649 is the 69329-th centered octagonal number.

It is an amenable number.

19225763649 is a deficient number, since it is larger than the sum of its proper divisors (8545384704).

19225763649 is an frugal number, since it uses more digits than its factorization.

19225763649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92444 (or 46222 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 19225763649 in words is "nineteen billion, two hundred twenty-five million, seven hundred sixty-three thousand, six hundred forty-nine".