1666750325 has 6 divisors (see below), whose sum is σ = 2066770434. Its totient is φ = 1333400240.

The previous prime is 1666750313. The next prime is 1666750343. The reversal of 1666750325 is 5230576661.

It can be written as a sum of positive squares in 3 ways, for example, as 4231249 + 1662519076 = 2057^2 + 40774^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1666750325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33334982 + ... + 33335031.

It is an arithmetic number, because the mean of its divisors is an integer number (344461739).

Almost surely, 2^1666750325 is an apocalyptic number.

It is an amenable number.

1666750325 is a deficient number, since it is larger than the sum of its proper divisors (400020109).

1666750325 is an equidigital number, since it uses as much as digits as its factorization.

1666750325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66670023 (or 66670018 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 1666750325 is about 40825.8536346762. The cubic root of 1666750325 is about 1185.6509387492.

The spelling of 1666750325 in words is "one billion, six hundred sixty-six million, seven hundred fifty thousand, three hundred twenty-five".