1606745722 has 4 divisors (see below), whose sum is σ = 2410118586. Its totient is φ = 803372860.

The previous prime is 1606745711. The next prime is 1606745737. The reversal of 1606745722 is 2275476061.

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

It can be written as a sum of positive squares in only one way, i.e., 1014358801 + 592386921 = 31849^2 + 24339^2 .

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401686429 + ... + 401686432.

Almost surely, 2^1606745722 is an apocalyptic number.

1606745722 is a deficient number, since it is larger than the sum of its proper divisors (803372864).

1606745722 is an equidigital number, since it uses as much as digits as its factorization.

1606745722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803372863.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 1606745722 is about 40084.2328353681. The cubic root of 1606745722 is about 1171.2485082332.

The spelling of 1606745722 in words is "one billion, six hundred six million, seven hundred forty-five thousand, seven hundred twenty-two".