1668025537 has 2 divisors, whose sum is σ = 1668025538. Its totient is φ = 1668025536.

The previous prime is 1668025511. The next prime is 1668025589. The reversal of 1668025537 is 7355208661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1531626496 + 136399041 = 39136^2 + 11679^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668025537 - 2¹⁹ = 1667501249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668025493 and 1668025502.

It is not a weakly prime, because it can be changed into another prime (1668025937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834012768 + 834012769.

It is an arithmetic number, because the mean of its divisors is an integer number (834012769).

Almost surely, 2^1668025537 is an apocalyptic number.

It is an amenable number.

1668025537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668025537 is an equidigital number, since it uses as much as digits as its factorization.

1668025537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 1668025537 is about 40841.4683501952. The cubic root of 1668025537 is about 1185.9532377503.

The spelling of 1668025537 in words is "one billion, six hundred sixty-eight million, twenty-five thousand, five hundred thirty-seven".