1266231566 has 16 divisors (see below), whose sum is σ = 1927270800. Its totient is φ = 623848128.

The previous prime is 1266231539. The next prime is 1266231583. The reversal of 1266231566 is 6651326621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54770 + ... + 74378.

It is an arithmetic number, because the mean of its divisors is an integer number (120454425).

Almost surely, 2^1266231566 is an apocalyptic number.

1266231566 is a deficient number, since it is larger than the sum of its proper divisors (661039234).

1266231566 is a wasteful number, since it uses less digits than its factorization.

1266231566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20083.

The product of its digits is 77760, while the sum is 38.

The square root of 1266231566 is about 35584.1476784256. The cubic root of 1266231566 is about 1081.8599539941.

The spelling of 1266231566 in words is "one billion, two hundred sixty-six million, two hundred thirty-one thousand, five hundred sixty-six".