18765850493 has 4 divisors (see below), whose sum is σ = 20209377468. Its totient is φ = 17322323520.

The previous prime is 18765850483. The next prime is 18765850553. The reversal of 18765850493 is 39405856781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9380503609 + 9385346884 = 96853^2 + 96878^2 .

It is a cyclic number.

It is not a de Polignac number, because 18765850493 - 2⁸ = 18765850237 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 (18765850483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721763468 + ... + 721763493.

It is an arithmetic number, because the mean of its divisors is an integer number (5052344367).

Almost surely, 2^18765850493 is an apocalyptic number.

18765850493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18765850493 is a deficient number, since it is larger than the sum of its proper divisors (1443526975).

18765850493 is a wasteful number, since it uses less digits than its factorization.

18765850493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443526974.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 18765850493 in words is "eighteen billion, seven hundred sixty-five million, eight hundred fifty thousand, four hundred ninety-three".