1288197666 has 24 divisors (see below), whose sum is σ = 3189823104. Its totient is φ = 368056440.

The previous prime is 1288197629. The next prime is 1288197671. The reversal of 1288197666 is 6667918821.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5111770 + ... + 5112021.

It is an arithmetic number, because the mean of its divisors is an integer number (132909296).

Almost surely, 2^1288197666 is an apocalyptic number.

1288197666 is an abundant number, since it is smaller than the sum of its proper divisors (1901625438).

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

1288197666 is a wasteful number, since it uses less digits than its factorization.

1288197666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10223806 (or 10223803 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1288197666 is about 35891.4706580825. The cubic root of 1288197666 is about 1088.0800209896.

The spelling of 1288197666 in words is "one billion, two hundred eighty-eight million, one hundred ninety-seven thousand, six hundred sixty-six".