12147566656 has 63 divisors (see below), whose sum is σ = 25241091631. Its totient is φ = 5800006784.

The previous prime is 12147566617. The next prime is 12147566671. The reversal of 12147566656 is 65666574121.

The square root of 12147566656 is 110216.

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

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20279445 + ... + 20280043.

Almost surely, 2^12147566656 is an apocalyptic number.

12147566656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

12147566656 is the 110216-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12147566656

12147566656 is an abundant number, since it is smaller than the sum of its proper divisors (13093524975).

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

12147566656 is an frugal number, since it uses more digits than its factorization.

12147566656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 624 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 49.

Multiplying 12147566656 by its sum of digits (49), we get a square (595230766144 = 771512²).

The spelling of 12147566656 in words is "twelve billion, one hundred forty-seven million, five hundred sixty-six thousand, six hundred fifty-six".