18958174493 has 4 divisors (see below), whose sum is σ = 18989824800. Its totient is φ = 18926524188.

The previous prime is 18958174489. The next prime is 18958174513. The reversal of 18958174493 is 39447185981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18958174493 - 2² = 18958174489 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 (18958174793) 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, 15824255 + ... + 15825452.

It is an arithmetic number, because the mean of its divisors is an integer number (4747456200).

Almost surely, 2^18958174493 is an apocalyptic number.

It is an amenable number.

18958174493 is a deficient number, since it is larger than the sum of its proper divisors (31650307).

18958174493 is an equidigital number, since it uses as much as digits as its factorization.

18958174493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31650306.

The product of its digits is 8709120, while the sum is 59.

The spelling of 18958174493 in words is "eighteen billion, nine hundred fifty-eight million, one hundred seventy-four thousand, four hundred ninety-three".