18964983493 has 8 divisors (see below), whose sum is σ = 19445108760. Its totient is φ = 18485694720.

The previous prime is 18964983473. The next prime is 18964983497. The reversal of 18964983493 is 39438946981.

It can be written as a sum of positive squares in 4 ways, for example, as 5758836769 + 13206146724 = 75887^2 + 114918^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18964983493 - 2¹⁷ = 18964852421 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 (18964983497) 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, 163080 + ... + 254017.

It is an arithmetic number, because the mean of its divisors is an integer number (2430638595).

Almost surely, 2^18964983493 is an apocalyptic number.

It is an amenable number.

18964983493 is a deficient number, since it is larger than the sum of its proper divisors (480125267).

18964983493 is a wasteful number, since it uses less digits than its factorization.

18964983493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418247.

The product of its digits is 40310784, while the sum is 64.

The spelling of 18964983493 in words is "eighteen billion, nine hundred sixty-four million, nine hundred eighty-three thousand, four hundred ninety-three".