1246561666 has 24 divisors (see below), whose sum is σ = 2207599056. Its totient is φ = 526264200.

The previous prime is 1246561649. The next prime is 1246561727. The reversal of 1246561666 is 6661656421.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88360 + ... + 101491.

It is an arithmetic number, because the mean of its divisors is an integer number (91983294).

Almost surely, 2^1246561666 is an apocalyptic number.

1246561666 is a deficient number, since it is larger than the sum of its proper divisors (961037390).

1246561666 is a wasteful number, since it uses less digits than its factorization.

1246561666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189934 (or 189927 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 1246561666 is about 35306.6801894486. The cubic root of 1246561666 is about 1076.2287492224.

The spelling of 1246561666 in words is "one billion, two hundred forty-six million, five hundred sixty-one thousand, six hundred sixty-six".