6634171552721 has 2 divisors, whose sum is σ = 6634171552722. Its totient is φ = 6634171552720.

The previous prime is 6634171552703. The next prime is 6634171552727. The reversal of 6634171552721 is 1272551714366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5872208413696 + 761963139025 = 2423264^2 + 872905^2 .

It is a cyclic number.

It is not a de Polignac number, because 6634171552721 - 2²² = 6634167358417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6634171552721.

It is not a weakly prime, because it can be changed into another prime (6634171552727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3317085776360 + 3317085776361.

It is an arithmetic number, because the mean of its divisors is an integer number (3317085776361).

Almost surely, 2^{6634171552721} is an apocalyptic number.

It is an amenable number.

6634171552721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6634171552721 is an equidigital number, since it uses as much as digits as its factorization.

6634171552721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 50.

The spelling of 6634171552721 in words is "six trillion, six hundred thirty-four billion, one hundred seventy-one million, five hundred fifty-two thousand, seven hundred twenty-one".