18585774416 has 80 divisors (see below), whose sum is σ = 42561972288. Its totient is φ = 7766169600.

The previous prime is 18585774413. The next prime is 18585774437. The reversal of 18585774416 is 61447758581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18585774413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56426 + ... + 200886.

Almost surely, 2^18585774416 is an apocalyptic number.

18585774416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18585774416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21280986144).

18585774416 is an abundant number, since it is smaller than the sum of its proper divisors (23976197872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18585774416 is a wasteful number, since it uses less digits than its factorization.

18585774416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144540 (or 144534 counting only the distinct ones).

The product of its digits is 7526400, while the sum is 56.

The spelling of 18585774416 in words is "eighteen billion, five hundred eighty-five million, seven hundred seventy-four thousand, four hundred sixteen".