18543496238656 has 63 divisors (see below), whose sum is σ = 37002164727171. Its totient is φ = 9220400799744.

The previous prime is 18543496238653. The next prime is 18543496238671. The reversal of 18543496238656 is 65683269434581.

The square root of 18543496238656 is 4306216.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 365347713600 + 18178148525056 = 604440^2 + 4263584^2 .

It is a super-2 number, since 2×18543496238656² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18543496238653) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6648796110 + ... + 6648798898.

Almost surely, 2^{18543496238656} is an apocalyptic number.

18543496238656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18543496238656 is the 4306216-th square number.

It is an amenable number.

18543496238656 is a deficient number, since it is larger than the sum of its proper divisors (18458668488515).

18543496238656 is an frugal number, since it uses more digits than its factorization.

18543496238656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5976 (or 2984 counting only the distinct ones).

The product of its digits is 895795200, while the sum is 70.

The spelling of 18543496238656 in words is "eighteen trillion, five hundred forty-three billion, four hundred ninety-six million, two hundred thirty-eight thousand, six hundred fifty-six".