1643370162461 has 2 divisors, whose sum is σ = 1643370162462. Its totient is φ = 1643370162460.

The previous prime is 1643370162439. The next prime is 1643370162481. The reversal of 1643370162461 is 1642610733461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1635521265625 + 7848896836 = 1278875^2 + 88594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643370162461 - 2⁶ = 1643370162397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643370162431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821685081230 + 821685081231.

It is an arithmetic number, because the mean of its divisors is an integer number (821685081231).

Almost surely, 2^{1643370162461} is an apocalyptic number.

It is an amenable number.

1643370162461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643370162461 is an equidigital number, since it uses as much as digits as its factorization.

1643370162461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 1643370162461 in words is "one trillion, six hundred forty-three billion, three hundred seventy million, one hundred sixty-two thousand, four hundred sixty-one".