1266221056 has 51 divisors (see below), whose sum is σ = 2550772731. Its totient is φ = 628555776.

The previous prime is 1266221053. The next prime is 1266221059. The reversal of 1266221056 is 6501226621.

The square root of 1266221056 is 35584.

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

It is an interprime number because it is at equal distance from previous prime (1266221053) and next prime (1266221059).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266221053) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9109435 + ... + 9109573.

Almost surely, 2^1266221056 is an apocalyptic number.

1266221056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1266221056 is the 35584-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266221056

1266221056 is an abundant number, since it is smaller than the sum of its proper divisors (1284551675).

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

1266221056 is an frugal number, since it uses more digits than its factorization.

1266221056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The cubic root of 1266221056 is about 1081.8569607608.

Adding to 1266221056 its reverse (6501226621), we get a palindrome (7767447677).

The spelling of 1266221056 in words is "one billion, two hundred sixty-six million, two hundred twenty-one thousand, fifty-six".