1266220544 has 40 divisors (see below), whose sum is σ = 2611612608. Its totient is φ = 612679680.

The previous prime is 1266220517. The next prime is 1266220567. The reversal of 1266220544 is 4450226621.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1266220544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24017 + ... + 55760.

Almost surely, 2^1266220544 is an apocalyptic number.

It is an amenable number.

1266220544 is an abundant number, since it is smaller than the sum of its proper divisors (1345392064).

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

1266220544 is an frugal number, since it uses more digits than its factorization.

1266220544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79826 (or 79810 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 1266220544 is about 35583.9928057547. The cubic root of 1266220544 is about 1081.8568149435.

The spelling of 1266220544 in words is "one billion, two hundred sixty-six million, two hundred twenty thousand, five hundred forty-four".