1650380566 has 4 divisors (see below), whose sum is σ = 2475570852. Its totient is φ = 825190282.

The previous prime is 1650380561. The next prime is 1650380581. The reversal of 1650380566 is 6650830561.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650380561) by changing a digit.

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 as a sum of consecutive naturals, namely, 412595140 + ... + 412595143.

It is an arithmetic number, because the mean of its divisors is an integer number (618892713).

Almost surely, 2^1650380566 is an apocalyptic number.

1650380566 is a deficient number, since it is larger than the sum of its proper divisors (825190286).

1650380566 is an equidigital number, since it uses as much as digits as its factorization.

1650380566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825190285.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1650380566 is about 40624.8761967344. The cubic root of 1650380566 is about 1181.7565923339.

The spelling of 1650380566 in words is "one billion, six hundred fifty million, three hundred eighty thousand, five hundred sixty-six".