2007191666 has 8 divisors (see below), whose sum is σ = 3187892700. Its totient is φ = 944560768.

The previous prime is 2007191663. The next prime is 2007191723. The reversal of 2007191666 is 6661917002.

It can be written as a sum of positive squares in 2 ways, for example, as 1811779225 + 195412441 = 42565^2 + 13979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2007191663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29517491 + ... + 29517558.

Almost surely, 2^2007191666 is an apocalyptic number.

2007191666 is a deficient number, since it is larger than the sum of its proper divisors (1180701034).

2007191666 is a wasteful number, since it uses less digits than its factorization.

2007191666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59035068.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2007191666 is about 44801.6926689160. The cubic root of 2007191666 is about 1261.4293986431.

The spelling of 2007191666 in words is "two billion, seven million, one hundred ninety-one thousand, six hundred sixty-six".