18539312774 has 8 divisors (see below), whose sum is σ = 27833735640. Its totient is φ = 9261400896.

The previous prime is 18539312773. The next prime is 18539312843. The reversal of 18539312774 is 47721393581.

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

It is a super-2 number, since 2×18539312774² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18539312773) 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, 4124939 + ... + 4129430.

It is an arithmetic number, because the mean of its divisors is an integer number (3479216955).

Almost surely, 2^18539312774 is an apocalyptic number.

18539312774 is a deficient number, since it is larger than the sum of its proper divisors (9294422866).

18539312774 is a wasteful number, since it uses less digits than its factorization.

18539312774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255494.

The product of its digits is 1270080, while the sum is 50.

The spelling of 18539312774 in words is "eighteen billion, five hundred thirty-nine million, three hundred twelve thousand, seven hundred seventy-four".