19661948224 has 28 divisors (see below), whose sum is σ = 39188587104. Its totient is φ = 9787658624.

The previous prime is 19661948221. The next prime is 19661948227. The reversal of 19661948224 is 42284916691.

It is an interprime number because it is at equal distance from previous prime (19661948221) and next prime (19661948227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19661948221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662164 + ... + 691219.

Almost surely, 2^19661948224 is an apocalyptic number.

It is an amenable number.

19661948224 is a deficient number, since it is larger than the sum of its proper divisors (19526638880).

19661948224 is a wasteful number, since it uses less digits than its factorization.

19661948224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353622 (or 1353612 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The spelling of 19661948224 in words is "nineteen billion, six hundred sixty-one million, nine hundred forty-eight thousand, two hundred twenty-four".