1604938174649 has 2 divisors, whose sum is σ = 1604938174650. Its totient is φ = 1604938174648.

The previous prime is 1604938174531. The next prime is 1604938174669. The reversal of 1604938174649 is 9464718394061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1489759390249 + 115178784400 = 1220557^2 + 339380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604938174649 - 2¹² = 1604938170553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1604938174591 and 1604938174600.

It is not a weakly prime, because it can be changed into another prime (1604938174669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802469087324 + 802469087325.

It is an arithmetic number, because the mean of its divisors is an integer number (802469087325).

Almost surely, 2^{1604938174649} is an apocalyptic number.

It is an amenable number.

1604938174649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604938174649 is an equidigital number, since it uses as much as digits as its factorization.

1604938174649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 1604938174649 in words is "one trillion, six hundred four billion, nine hundred thirty-eight million, one hundred seventy-four thousand, six hundred forty-nine".