6606866491 has 2 divisors, whose sum is σ = 6606866492. Its totient is φ = 6606866490.

The previous prime is 6606866479. The next prime is 6606866501. The reversal of 6606866491 is 1946686066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6606866491 - 2²³ = 6598477883 is a prime.

It is not a weakly prime, because it can be changed into another prime (6606866401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3303433245 + 3303433246.

It is an arithmetic number, because the mean of its divisors is an integer number (3303433246).

Almost surely, 2^6606866491 is an apocalyptic number.

6606866491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6606866491 is an equidigital number, since it uses as much as digits as its factorization.

6606866491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The square root of 6606866491 is about 81282.6333911494. The cubic root of 6606866491 is about 1876.4277354126.

The spelling of 6606866491 in words is "six billion, six hundred six million, eight hundred sixty-six thousand, four hundred ninety-one".