6660190591 has 2 divisors, whose sum is σ = 6660190592. Its totient is φ = 6660190590.

The previous prime is 6660190561. The next prime is 6660190679. The reversal of 6660190591 is 1950910666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6660190591 - 2²³ = 6651801983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660190531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330095295 + 3330095296.

It is an arithmetic number, because the mean of its divisors is an integer number (3330095296).

Almost surely, 2^6660190591 is an apocalyptic number.

6660190591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660190591 is an equidigital number, since it uses as much as digits as its factorization.

6660190591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 6660190591 is about 81609.9907548089. The cubic root of 6660190591 is about 1881.4624382695.

The spelling of 6660190591 in words is "six billion, six hundred sixty million, one hundred ninety thousand, five hundred ninety-one".