1604921437397 has 2 divisors, whose sum is σ = 1604921437398. Its totient is φ = 1604921437396.

The previous prime is 1604921437391. The next prime is 1604921437417. The reversal of 1604921437397 is 7937341294061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1460892838276 + 144028599121 = 1208674^2 + 379511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604921437397 - 2¹² = 1604921433301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604921437391) 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, 802460718698 + 802460718699.

It is an arithmetic number, because the mean of its divisors is an integer number (802460718699).

Almost surely, 2^{1604921437397} is an apocalyptic number.

It is an amenable number.

1604921437397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604921437397 is an equidigital number, since it uses as much as digits as its factorization.

1604921437397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 1604921437397 in words is "one trillion, six hundred four billion, nine hundred twenty-one million, four hundred thirty-seven thousand, three hundred ninety-seven".