1009388666 has 48 divisors (see below), whose sum is σ = 1813544640. Its totient is φ = 417605760.

The previous prime is 1009388663. The next prime is 1009388669. The reversal of 1009388666 is 6668839001.

It is an interprime number because it is at equal distance from previous prime (1009388663) and next prime (1009388669).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1009388666.

It is not an unprimeable number, because it can be changed into a prime (1009388663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269555 + ... + 273273.

It is an arithmetic number, because the mean of its divisors is an integer number (37782180).

Almost surely, 2^1009388666 is an apocalyptic number.

1009388666 is a deficient number, since it is larger than the sum of its proper divisors (804155974).

1009388666 is a wasteful number, since it uses less digits than its factorization.

1009388666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831 (or 3818 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 1009388666 is about 31770.8776397505. The cubic root of 1009388666 is about 1003.1198119846.

The spelling of 1009388666 in words is "one billion, nine million, three hundred eighty-eight thousand, six hundred sixty-six".