6646404046801 has 2 divisors, whose sum is σ = 6646404046802. Its totient is φ = 6646404046800.

The previous prime is 6646404046783. The next prime is 6646404046811. The reversal of 6646404046801 is 1086404046466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5714126899776 + 932277147025 = 2390424^2 + 965545^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646404046801 - 2⁵ = 6646404046769 is a prime.

It is not a weakly prime, because it can be changed into another prime (6646404046811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323202023400 + 3323202023401.

It is an arithmetic number, because the mean of its divisors is an integer number (3323202023401).

Almost surely, 2^{6646404046801} is an apocalyptic number.

It is an amenable number.

6646404046801 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646404046801 is an equidigital number, since it uses as much as digits as its factorization.

6646404046801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 49.

The spelling of 6646404046801 in words is "six trillion, six hundred forty-six billion, four hundred four million, forty-six thousand, eight hundred one".