6644121707 has 2 divisors, whose sum is σ = 6644121708. Its totient is φ = 6644121706.

The previous prime is 6644121667. The next prime is 6644121719. The reversal of 6644121707 is 7071214466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6644121707 - 2⁶ = 6644121643 is a prime.

It is not a weakly prime, because it can be changed into another prime (6644121727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322060853 + 3322060854.

It is an arithmetic number, because the mean of its divisors is an integer number (3322060854).

Almost surely, 2^6644121707 is an apocalyptic number.

6644121707 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644121707 is an equidigital number, since it uses as much as digits as its factorization.

6644121707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 6644121707 is about 81511.4820562110. The cubic root of 6644121707 is about 1879.9480998008.

The spelling of 6644121707 in words is "six billion, six hundred forty-four million, one hundred twenty-one thousand, seven hundred seven".