19494185493 has 8 divisors (see below), whose sum is σ = 26596718368. Its totient is φ = 12693888144.

The previous prime is 19494185489. The next prime is 19494185507. The reversal of 19494185493 is 39458149491.

It is a happy number.

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

It is not a de Polignac number, because 19494185493 - 2² = 19494185489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19494185393) 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, 75558730 + ... + 75558987.

It is an arithmetic number, because the mean of its divisors is an integer number (3324589796).

Almost surely, 2^19494185493 is an apocalyptic number.

It is an amenable number.

19494185493 is a deficient number, since it is larger than the sum of its proper divisors (7102532875).

19494185493 is a wasteful number, since it uses less digits than its factorization.

19494185493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151117763.

The product of its digits is 5598720, while the sum is 57.

The spelling of 19494185493 in words is "nineteen billion, four hundred ninety-four million, one hundred eighty-five thousand, four hundred ninety-three".