1640504995673 has 2 divisors, whose sum is σ = 1640504995674. Its totient is φ = 1640504995672.

The previous prime is 1640504995669. The next prime is 1640504995693. The reversal of 1640504995673 is 3765994050461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1330626846784 + 309878148889 = 1153528^2 + 556667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640504995673 - 2² = 1640504995669 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640504995693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820252497836 + 820252497837.

It is an arithmetic number, because the mean of its divisors is an integer number (820252497837).

Almost surely, 2^{1640504995673} is an apocalyptic number.

It is an amenable number.

1640504995673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640504995673 is an equidigital number, since it uses as much as digits as its factorization.

1640504995673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24494400, while the sum is 59.

The spelling of 1640504995673 in words is "one trillion, six hundred forty billion, five hundred four million, nine hundred ninety-five thousand, six hundred seventy-three".