6646726477 has 2 divisors, whose sum is σ = 6646726478. Its totient is φ = 6646726476.

The previous prime is 6646726451. The next prime is 6646726481. The reversal of 6646726477 is 7746276466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3664365156 + 2982361321 = 60534^2 + 54611^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646726477 - 2⁷ = 6646726349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6646726777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323363238 + 3323363239.

It is an arithmetic number, because the mean of its divisors is an integer number (3323363239).

Almost surely, 2^6646726477 is an apocalyptic number.

It is an amenable number.

6646726477 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646726477 is an equidigital number, since it uses as much as digits as its factorization.

6646726477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14224896, while the sum is 55.

The square root of 6646726477 is about 81527.4584235275. The cubic root of 6646726477 is about 1880.1937401251.

The spelling of 6646726477 in words is "six billion, six hundred forty-six million, seven hundred twenty-six thousand, four hundred seventy-seven".