1646610145 has 8 divisors (see below), whose sum is σ = 1977319656. Its totient is φ = 1316363136.

The previous prime is 1646610139. The next prime is 1646610197. The reversal of 1646610145 is 5410166461.

It can be written as a sum of positive squares in 4 ways, for example, as 733543056 + 913067089 = 27084^2 + 30217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1646610145 - 2⁹ = 1646609633 is a prime.

It is a super-2 number, since 2×1646610145² = 5422649939233842050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646610145.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 107742 + ... + 122071.

It is an arithmetic number, because the mean of its divisors is an integer number (247164957).

Almost surely, 2^1646610145 is an apocalyptic number.

It is an amenable number.

1646610145 is a deficient number, since it is larger than the sum of its proper divisors (330709511).

1646610145 is a wasteful number, since it uses less digits than its factorization.

1646610145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231251.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1646610145 is about 40578.4443393287. Note that the first 3 decimals coincide. The cubic root of 1646610145 is about 1180.8559682753.

The spelling of 1646610145 in words is "one billion, six hundred forty-six million, six hundred ten thousand, one hundred forty-five".