1191373666 has 16 divisors (see below), whose sum is σ = 2076972480. Its totient is φ = 501934320.

The previous prime is 1191373643. The next prime is 1191373717. The reversal of 1191373666 is 6663731911.

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, 720345 + ... + 721996.

It is an arithmetic number, because the mean of its divisors is an integer number (129810780).

Almost surely, 2^1191373666 is an apocalyptic number.

1191373666 is a deficient number, since it is larger than the sum of its proper divisors (885598814).

1191373666 is a wasteful number, since it uses less digits than its factorization.

1191373666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442409.

The product of its digits is 122472, while the sum is 43.

The square root of 1191373666 is about 34516.2811728031. The cubic root of 1191373666 is about 1060.1060965359.

The spelling of 1191373666 in words is "one billion, one hundred ninety-one million, three hundred seventy-three thousand, six hundred sixty-six".