19725065439 has 8 divisors (see below), whose sum is σ = 27847151280. Its totient is φ = 12376511616.

The previous prime is 19725065431. The next prime is 19725065471. The reversal of 19725065439 is 93456052791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19725065439 - 2³ = 19725065431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 386765989 = 19725065439 / (1 + 9 + 7 + 2 + 5 + 0 + 6 + 5 + 4 + 3 + 9).

It is a junction number, because it is equal to n+sod(n) for n = 19725065391 and 19725065400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19725065431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193382944 + ... + 193383045.

It is an arithmetic number, because the mean of its divisors is an integer number (3480893910).

Almost surely, 2^19725065439 is an apocalyptic number.

19725065439 is a deficient number, since it is larger than the sum of its proper divisors (8122085841).

19725065439 is a wasteful number, since it uses less digits than its factorization.

19725065439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386766009.

The product of its (nonzero) digits is 2041200, while the sum is 51.

The spelling of 19725065439 in words is "nineteen billion, seven hundred twenty-five million, sixty-five thousand, four hundred thirty-nine".