6649864127 has 2 divisors, whose sum is σ = 6649864128. Its totient is φ = 6649864126.

The previous prime is 6649864103. The next prime is 6649864147. The reversal of 6649864127 is 7214689466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6649864127 - 2⁶ = 6649864063 is a prime.

It is a super-2 number, since 2×6649864127² = 88441385815122944258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6649864147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324932063 + 3324932064.

It is an arithmetic number, because the mean of its divisors is an integer number (3324932064).

Almost surely, 2^6649864127 is an apocalyptic number.

6649864127 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649864127 is an equidigital number, since it uses as much as digits as its factorization.

6649864127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 53.

The square root of 6649864127 is about 81546.6990564302. The cubic root of 6649864127 is about 1880.4895479870.

The spelling of 6649864127 in words is "six billion, six hundred forty-nine million, eight hundred sixty-four thousand, one hundred twenty-seven".