19947243753 has 24 divisors (see below), whose sum is σ = 29137661280. Its totient is φ = 13148741760.

The previous prime is 19947243707. The next prime is 19947243779. The reversal of 19947243753 is 35734274991.

19947243753 is a `hidden beast` number, since 1 + 9 + 94 + 72 + 437 + 53 = 666.

It is not a de Polignac number, because 19947243753 - 2⁸ = 19947243497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19947243753.

It is not an unprimeable number, because it can be changed into a prime (19947243793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402718 + ... + 449528.

It is an arithmetic number, because the mean of its divisors is an integer number (1214069220).

Almost surely, 2^19947243753 is an apocalyptic number.

It is an amenable number.

19947243753 is a deficient number, since it is larger than the sum of its proper divisors (9190417527).

19947243753 is a wasteful number, since it uses less digits than its factorization.

19947243753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47349 (or 47346 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 19947243753 in words is "nineteen billion, nine hundred forty-seven million, two hundred forty-three thousand, seven hundred fifty-three".