1640206726733 has 2 divisors, whose sum is σ = 1640206726734. Its totient is φ = 1640206726732.

The previous prime is 1640206726621. The next prime is 1640206726771. The reversal of 1640206726733 is 3376276020461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1542270901924 + 97935824809 = 1241882^2 + 312947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640206726733 - 2³² = 1635911759437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640206726783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820103363366 + 820103363367.

It is an arithmetic number, because the mean of its divisors is an integer number (820103363367).

Almost surely, 2^{1640206726733} is an apocalyptic number.

It is an amenable number.

1640206726733 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640206726733 is an equidigital number, since it uses as much as digits as its factorization.

1640206726733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 47.

The spelling of 1640206726733 in words is "one trillion, six hundred forty billion, two hundred six million, seven hundred twenty-six thousand, seven hundred thirty-three".