1643740473497 has 2 divisors, whose sum is σ = 1643740473498. Its totient is φ = 1643740473496.

The previous prime is 1643740473433. The next prime is 1643740473509. The reversal of 1643740473497 is 7943740473461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1643141986201 + 598487296 = 1281851^2 + 24464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643740473497 - 2⁶ = 1643740473433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643740443497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821870236748 + 821870236749.

It is an arithmetic number, because the mean of its divisors is an integer number (821870236749).

Almost surely, 2^{1643740473497} is an apocalyptic number.

It is an amenable number.

1643740473497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643740473497 is an equidigital number, since it uses as much as digits as its factorization.

1643740473497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42674688, while the sum is 59.

The spelling of 1643740473497 in words is "one trillion, six hundred forty-three billion, seven hundred forty million, four hundred seventy-three thousand, four hundred ninety-seven".