4051643366521 has 2 divisors, whose sum is σ = 4051643366522. Its totient is φ = 4051643366520.

The previous prime is 4051643366437. The next prime is 4051643366539. The reversal of 4051643366521 is 1256633461504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3805870346496 + 245773020025 = 1950864^2 + 495755^2 .

It is a cyclic number.

It is not a de Polignac number, because 4051643366521 - 2³⁵ = 4017283628153 is a prime.

It is not a weakly prime, because it can be changed into another prime (4051643366591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2025821683260 + 2025821683261.

It is an arithmetic number, because the mean of its divisors is an integer number (2025821683261).

Almost surely, 2^{4051643366521} is an apocalyptic number.

It is an amenable number.

4051643366521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4051643366521 is an equidigital number, since it uses as much as digits as its factorization.

4051643366521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 4051643366521 in words is "four trillion, fifty-one billion, six hundred forty-three million, three hundred sixty-six thousand, five hundred twenty-one".