1266563564 has 18 divisors (see below), whose sum is σ = 2578361940. Its totient is φ = 542812872.

The previous prime is 1266563549. The next prime is 1266563633. The reversal of 1266563564 is 4653656621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3230834 + ... + 3231225.

It is an arithmetic number, because the mean of its divisors is an integer number (143242330).

Almost surely, 2^1266563564 is an apocalyptic number.

1266563564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1266563564 is an abundant number, since it is smaller than the sum of its proper divisors (1311798376).

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

1266563564 is a wasteful number, since it uses less digits than its factorization.

1266563564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462077 (or 6462068 counting only the distinct ones).

The product of its digits is 777600, while the sum is 44.

The square root of 1266563564 is about 35588.8123432070. The cubic root of 1266563564 is about 1081.9544980370.

The spelling of 1266563564 in words is "one billion, two hundred sixty-six million, five hundred sixty-three thousand, five hundred sixty-four".