1604163557 has 2 divisors, whose sum is σ = 1604163558. Its totient is φ = 1604163556.

The previous prime is 1604163529. The next prime is 1604163577. The reversal of 1604163557 is 7553614061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1602721156 + 1442401 = 40034^2 + 1201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604163557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1604163557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604163577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802081778 + 802081779.

It is an arithmetic number, because the mean of its divisors is an integer number (802081779).

Almost surely, 2^1604163557 is an apocalyptic number.

It is an amenable number.

1604163557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604163557 is an equidigital number, since it uses as much as digits as its factorization.

1604163557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1604163557 is about 40052.0106486553. The cubic root of 1604163557 is about 1170.6207427575.

The spelling of 1604163557 in words is "one billion, six hundred four million, one hundred sixty-three thousand, five hundred fifty-seven".