18774393455 has 4 divisors (see below), whose sum is σ = 22529272152. Its totient is φ = 15019514760.

The previous prime is 18774393437. The next prime is 18774393457. The reversal of 18774393455 is 55439347781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55439347781 = 122051 ⋅454231.

It is not a de Polignac number, because 18774393455 - 2¹⁰ = 18774392431 is a prime.

It is a super-3 number, since 3×18774393455³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18774393455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18774393457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1877439341 + ... + 1877439350.

It is an arithmetic number, because the mean of its divisors is an integer number (5632318038).

Almost surely, 2^18774393455 is an apocalyptic number.

18774393455 is a deficient number, since it is larger than the sum of its proper divisors (3754878697).

18774393455 is an equidigital number, since it uses as much as digits as its factorization.

18774393455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3754878696.

The product of its digits is 12700800, while the sum is 56.

The spelling of 18774393455 in words is "eighteen billion, seven hundred seventy-four million, three hundred ninety-three thousand, four hundred fifty-five".