18774531536 has 20 divisors (see below), whose sum is σ = 38515399812. Its totient is φ = 8835073536.

The previous prime is 18774531511. The next prime is 18774531557. The reversal of 18774531536 is 63513547781.

It can be written as a sum of positive squares in 2 ways, for example, as 5104245136 + 13670286400 = 71444^2 + 116920^2 .

It is a congruent number.

It is an unprimeable number.

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, 34511735 + ... + 34512278.

Almost surely, 2^18774531536 is an apocalyptic number.

18774531536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18774531536 is an abundant number, since it is smaller than the sum of its proper divisors (19740868276).

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

18774531536 is a wasteful number, since it uses less digits than its factorization.

18774531536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69024038 (or 69024032 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 50.

The spelling of 18774531536 in words is "eighteen billion, seven hundred seventy-four million, five hundred thirty-one thousand, five hundred thirty-six".