1266197666 has 16 divisors (see below), whose sum is σ = 1997561088. Its totient is φ = 601114800.

The previous prime is 1266197663. The next prime is 1266197671. The reversal of 1266197666 is 6667916621.

It is not an unprimeable number, because it can be changed into a prime (1266197663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189380 + ... + 195951.

It is an arithmetic number, because the mean of its divisors is an integer number (124847568).

Almost surely, 2^1266197666 is an apocalyptic number.

1266197666 is a deficient number, since it is larger than the sum of its proper divisors (731363422).

1266197666 is a wasteful number, since it uses less digits than its factorization.

1266197666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385417.

The product of its digits is 979776, while the sum is 50.

The square root of 1266197666 is about 35583.6713395344. The cubic root of 1266197666 is about 1081.8502992620.

The spelling of 1266197666 in words is "one billion, two hundred sixty-six million, one hundred ninety-seven thousand, six hundred sixty-six".