1266521056 has 12 divisors (see below), whose sum is σ = 2493463392. Its totient is φ = 633260512.

The previous prime is 1266521021. The next prime is 1266521083. The reversal of 1266521056 is 6501256621.

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 as a sum of consecutive naturals, namely, 19789360 + ... + 19789423.

It is an arithmetic number, because the mean of its divisors is an integer number (207788616).

Almost surely, 2^1266521056 is an apocalyptic number.

1266521056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1266521056 is a deficient number, since it is larger than the sum of its proper divisors (1226942336).

1266521056 is an equidigital number, since it uses as much as digits as its factorization.

1266521056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39578793 (or 39578785 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1266521056 is about 35588.2151280448. The cubic root of 1266521056 is about 1081.9423938316.

Adding to 1266521056 its reverse (6501256621), we get a palindrome (7767777677).

The spelling of 1266521056 in words is "one billion, two hundred sixty-six million, five hundred twenty-one thousand, fifty-six".