1866006091 has 2 divisors, whose sum is σ = 1866006092. Its totient is φ = 1866006090.

The previous prime is 1866006059. The next prime is 1866006133. The reversal of 1866006091 is 1906006681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1866006091 - 2⁵ = 1866006059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1866006091.

It is not a weakly prime, because it can be changed into another prime (1866006011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933003045 + 933003046.

It is an arithmetic number, because the mean of its divisors is an integer number (933003046).

Almost surely, 2^1866006091 is an apocalyptic number.

1866006091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866006091 is an equidigital number, since it uses as much as digits as its factorization.

1866006091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1866006091 is about 43197.2926350715. The cubic root of 1866006091 is about 1231.1312418598.

The spelling of 1866006091 in words is "one billion, eight hundred sixty-six million, six thousand, ninety-one".