1640706465577 has 2 divisors, whose sum is σ = 1640706465578. Its totient is φ = 1640706465576.

The previous prime is 1640706465557. The next prime is 1640706465641. The reversal of 1640706465577 is 7755646070461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1138683202281 + 502023263296 = 1067091^2 + 708536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640706465577 - 2⁷ = 1640706465449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640706465557) 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, 820353232788 + 820353232789.

It is an arithmetic number, because the mean of its divisors is an integer number (820353232789).

Almost surely, 2^{1640706465577} is an apocalyptic number.

It is an amenable number.

1640706465577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640706465577 is an equidigital number, since it uses as much as digits as its factorization.

1640706465577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29635200, while the sum is 58.

The spelling of 1640706465577 in words is "one trillion, six hundred forty billion, seven hundred six million, four hundred sixty-five thousand, five hundred seventy-seven".