18512727640 has 32 divisors (see below), whose sum is σ = 45440332560. Its totient is φ = 6731900800.

The previous prime is 18512727619. The next prime is 18512727647. The reversal of 18512727640 is 4672721581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512727647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21036751 + ... + 21037630.

Almost surely, 2^18512727640 is an apocalyptic number.

18512727640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18512727640 is an abundant number, since it is smaller than the sum of its proper divisors (26927604920).

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

18512727640 is a wasteful number, since it uses less digits than its factorization.

18512727640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42074403 (or 42074399 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 18512727640 in words is "eighteen billion, five hundred twelve million, seven hundred twenty-seven thousand, six hundred forty".