2601666493 has 2 divisors, whose sum is σ = 2601666494. Its totient is φ = 2601666492.

The previous prime is 2601666427. The next prime is 2601666541. The reversal of 2601666493 is 3946661062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2600796004 + 870489 = 50998^2 + 933^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601666493 - 2⁹ = 2601665981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2601667493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300833246 + 1300833247.

It is an arithmetic number, because the mean of its divisors is an integer number (1300833247).

Almost surely, 2^2601666493 is an apocalyptic number.

It is an amenable number.

2601666493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2601666493 is an equidigital number, since it uses as much as digits as its factorization.

2601666493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 2601666493 is about 51006.5338265599. The cubic root of 2601666493 is about 1375.3625918461.

The spelling of 2601666493 in words is "two billion, six hundred one million, six hundred sixty-six thousand, four hundred ninety-three".