19745754643 has 8 divisors (see below), whose sum is σ = 20930235840. Its totient is φ = 18563825280.

The previous prime is 19745754631. The next prime is 19745754653. The reversal of 19745754643 is 34645754791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19745754643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19745754653) 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, 622008 + ... + 652981.

It is an arithmetic number, because the mean of its divisors is an integer number (2616279480).

Almost surely, 2^19745754643 is an apocalyptic number.

19745754643 is a deficient number, since it is larger than the sum of its proper divisors (1184481197).

19745754643 is a wasteful number, since it uses less digits than its factorization.

19745754643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275917.

The product of its digits is 12700800, while the sum is 55.

The spelling of 19745754643 in words is "nineteen billion, seven hundred forty-five million, seven hundred fifty-four thousand, six hundred forty-three".