1266365644 has 12 divisors (see below), whose sum is σ = 2227390704. Its totient is φ = 629968304.

The previous prime is 1266365629. The next prime is 1266365657. The reversal of 1266365644 is 4465636621.

It is a self number, because there is not a number n which added to its sum of digits gives 1266365644.

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 in 3 ways as a sum of consecutive naturals, for example, 802744 + ... + 804319.

It is an arithmetic number, because the mean of its divisors is an integer number (185615892).

Almost surely, 2^1266365644 is an apocalyptic number.

It is an amenable number.

1266365644 is a deficient number, since it is larger than the sum of its proper divisors (961025060).

1266365644 is a wasteful number, since it uses less digits than its factorization.

1266365644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607264 (or 1607262 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The square root of 1266365644 is about 35586.0315854409. The cubic root of 1266365644 is about 1081.8981377680.

The spelling of 1266365644 in words is "one billion, two hundred sixty-six million, three hundred sixty-five thousand, six hundred forty-four".