1680303557 has 2 divisors, whose sum is σ = 1680303558. Its totient is φ = 1680303556.

The previous prime is 1680303503. The next prime is 1680303577. The reversal of 1680303557 is 7553030861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242280516 + 438023041 = 35246^2 + 20929^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680303557 - 2²⁴ = 1663526341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680303557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680303577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840151778 + 840151779.

It is an arithmetic number, because the mean of its divisors is an integer number (840151779).

Almost surely, 2^1680303557 is an apocalyptic number.

It is an amenable number.

1680303557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680303557 is an equidigital number, since it uses as much as digits as its factorization.

1680303557 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 1680303557 is about 40991.5059128108. The cubic root of 1680303557 is about 1188.8559862056.

The spelling of 1680303557 in words is "one billion, six hundred eighty million, three hundred three thousand, five hundred fifty-seven".